Core Curriculum Assessment Report Feb2013 - …ous.auburn.edu/wp-content/uploads/core/2012-13-cc-reports/2012-13...Core Curriculum Assessment Report 2012‐2013 ... closer to a formal

Core Curriculum Assessment Report 2012‐2013

Department

Representative

Academic Year

Course Name / number

Physics

Michael Bozack, James Hanson

2012_13

PHYS1600/1617, PHYS1610/1617

SLO(s) being assessed: Student will..

Assessment Method(s):

2.

4.

[Explain how assessment for the measures associated with this SLO ‐ not grading for the course as a whole ‐ was conducted. You my cut/paste rubics for inclusion here, identify faculty reviewing committees, or identify specific kinds of test questions important to your method. Is this the method you initially planned to use? Provide a separate paragraph for each method].

SLO 10: Students will understand and appreciate methods and issues of science and technology.

The department has identified the following assessment methods: homework problems, laboratory experiences, classroom interactive sessions and test/exam questions. Faculty may elect to use any or all of these assessment methods to evaluate the effectiveness of their teaching. This format was approved by the

CCGEC in 2010‐2011. The department has selected MasteringPhysics online assignment system as the preferred assessment method because of the availability of the national average data. The national average data provide a comparison tool to enable us to gauge our students’ performance against those of other

ins tu ons across the country.In courses where there were mul ple sec ons with different instructors, the department committee has previously suggested that all instructors should use a common set of problems in MasteringPhysics to enable meaningful comparison of scores between different sections. These common sets of problems were provided to the instructors by the department committee before the start of each semester. However, some instructors preferred not to use MasteringPhysics for various reasons or to

use their own set of ques ons.Most of the instructors teaching the PHYS 1600/1610 series of courses used MasteringPhysics as the assessment method. One instructor who taught PHYS1617 Honors Physics II used

the final exam. The instructor for PHYS1607 did not do the required assessment.The department committee overseeing this course met on March 28, 2013, to discuss the results of those assessments carried out for the Fall 2012 semester. Data from the Spring 2013 semester will be discussed by the department

commi ee in Fall 2013. The commi ee members were:Chin‐Che Tin (Chair)Yu LinDavid MaurerMinseo ParkBesides the commi ee members listed above, the commi ee chair also invited other

faculty members teaching introductory physics courses to the mee ng to par cipate in the discussion.The following grading scale was used to determine competency level and this was based on typical scores

obtained from assessments over the last few years. Competency Scale:MasteringPhysics Online Assignment: ≥ (Na onal Average + 6%):Advanced Ability (Na onal Average 5%):Intermediate

Ability ≤ (Na onal Average – 6%):Basic Ability Non Comple on:Li le or No Abilityeg. If the national average score is 90%, then a score between 85 ‐ 65% would be considered Intermediate Ability. A score ≥ 96% would be considered Advanced Ability, and ≤ 84% would be Basic

Ability.Quizzes/Test/Exam: ≥ 85%:Advanced Ability 60 – 84%:Intermediate Ability 40 – 59%:Basic Ability ≤ 39%:Li le or No AbilityIn reconciling the language of the measures within

Student Learning Outcomes #10 with the topics normally covered in the physics courses, the department has chosen to adopt the following interpretations of the different measures. The department committee and instructors have used these interpretations as a general guideline in their choice of questions. The CCGEC

commi ee should bear this in mind as they review the problems used in our assessments.Measure 1: Use ques ons involving fundamental principles of physics such as the conserva on laws. Measure 2: Use

problems involving basic mathematical skills such as vector and scalar addition and subtraction, derivative

AGSC Content Area of Alignment:3.

Area III: Science and Math


Department

Representative

Academic Year


Physics


2012_13

PHYS1600/1617, PHYS1610/1617

Findings: What assessment data did each assessment method produce?5.

and integration (for calculus‐based class), finding slope and area (both algebra and calculus‐based class), dot and cross products (calculus‐based class), and common experimental techniques. Measure 3: Deduce

informa on from graphical, tabulated, or experimental data. Measure 4: Problems showing connec ons between science and society involving topics such as energy, health, etc.Measure 5: Problems requiring

knowledge and demonstra ng analy cal skills especially in those areas not covered above.

PHYS 1600 Fall 2012:‐ Average scores for Instructors F, G, and H were 87.0%, 81.1%, and 86.2%, respectively. Although, all were lower than the national average, the scores for Instructors F and H were within the limits to qualify for Intermediate Ability, but the score for Instructor G was in the scale of Basic Ability. PHYS 1600 Spring 2013:‐ Average score for Instructor F was 94.9% which was comparable to the national average of 93.0%.

PHYS 1610 Fall 2012:‐ Average scores for Instructors I, L, and J were 96.1%, 96.5%, and 95.5%, respectively. All were comparable with the national average of 94.29%.

PHYS 1610 Spring 2013:‐ Average score for Instructor I was 90.3% which was lower than the national average but still within the limits for Intermediate Ability. Instructor I used the questions from the common set of questions provided by the committee.‐ Average score for Instructor J was 95.5% which was higher than the national average of 91.59%. Instructor J only used some of the questions provided by the committee.

PHYS 1607 Fall 2012:‐ No data

PHYS 1617 Spring 2013:‐ Instructor M used final exam as the assessment method. Average score was 71% which was comparable to the typical test scores for introductory physics courses.

Instructor I’s comments:The results from our assessment indicate that students are learning valuable information in the course. Around 88% of the students know well about the historical foundations of the physics and display advance understanding of the basic physics principles and utilize them to analyze and solve problems (Measures 1, 2 and 5). Around 95% of the students have strong technical skill to conduct and interpret experiment and natural phenomena (Measure 3) and know well about the societal impact (Measure 4). We will use these results to indicate areas in which we can continue to strengthen the course and improve our abilities to enhance the students’ learning experiences.

Instructor J’s comments:I learned some things from the student comments in the University Evaluation system and from the results of the final exam. Based on that, I expect to have enhanced learning next year.


Department

Representative

Academic Year


Physics


2012_13

PHYS1600/1617, PHYS1610/1617

How did you (or will you) use the findings for improvement?

Additional Comments:

7.

8.

Committee Comments:9.

[What questions / issues / concerns did your data raise for the faculty teaching the course? What discussion did the faculty have about the findings? What future actions to improve student attainment of this outcome will the department / program take as a result of this analysis?]

[What else would you like the Committee to know about your assessment of this course or plans for the future?]

Scores for PHYS1600 Fall 2012 were not satisfactory for they were lower than the national average. The score for Instructor G was significantly lower to earn a rating of "Basic Ability". Instructors should ask the teaching assistants to give a brief discussion of the problems to better prepare the students for the assignments. Instructors should take note of the shortcomings in the various measures and to tailor their lectures accordingly in future classes.Scores for other courses were generally within the limits of the national average.

Actual names of the instructors were not used because we believe that these assessments should not be used as the assessment of the instructors.The department continues to have strong reservations about the language used in the description of the various measures constituting SLO#10. The wording of the measures does not match with the typical questions normally used in physics courses. The faculty believes that the department should be the one to determine the proper questions to use in the assessments. The instructors were therefore asked to use their best judgment in choosing the appropriate questions with the broad intents of the measures in mind. The department believes that assessments do help to provide insights into our teaching methods and their effectiveness. However, the department committee would suggest modifying the wording of the measures to make them more inline with our courses and to make the exercise more meaningful. For future assessments in large classes, the department committee would consider a different approach closer to a formal testing method in order to provide a more accurate measure of the competency level of the students.

Based on the comprehensive rubric for the appropriate SLO(s), indicate the extent of competency of the average student who has completed this core course in each learning outcome assigned to it:

6.

SLO 10 intermediate

SLO Level of Ability

PHYS1600‐1610‐1617 F12‐S13.pdfAttachment name:

PHYS 1600

ENGINEERING PHYSICS I

PHYS 1600 – Engineering Physics I Fall 2012 Instructors: F, G, H Number of Students: 142(F), 96 (G), 209 (H) Mode of Assessment: Assignment (MasteringPhysics)

Measure Problem % Complete % Average Score

% National

Score Instructor

F Instructor

G Instructor

H Instructor F Instructor G Instructor H

1 1.1 91.6 87.6 54.2 85.2 85.8 67.8 92.8

1.2 79.7 80 70 89.8 72.7 79.9 92.8

1.3 88.1 82.8 82.3 84.2 99.2

1.4 67.8 62.8 75.7 77.9 89.7

1.5 84.6 62.8 67.9 91.0 88.6 96.0 95.3 2 2.1 90.9 91 67.4 91.2 87.9 93.9 94.9

2.2 91.6 84.8 89.1 88.4 96.5

2.3 84.6 84.8 85.3 74.7 87.0

2.4 81.1 62.3 89.7 73.2 94.9

2.5 74.1 75.2 89.7 88.3 92.5 3 3.1 88.8 89 64.2 91.3 93.8 92.8 96.7

3.2 90.2 87.6 61.1 77.5 78.5 83.0 89.0

3.3 86.0 82.8 74.7 86.1 89.2 90.1 95.4

3.4 88.1 95.0 61.1 95.6

3.5 58.7 42.8 66.3 79.5 70.4 93.7 92.6

4 4.1 90.2 89.7 55.3 92.7 90.0 90.0 96.2

4.2 80.4 77.2 70 88.0 89.3 88.3 94.6

4.3 88.1 83.4 73.7 90.5 92.1 94.6 94.7

4.4 79.7 75.9 88.3 83.0 91.3

4.5 70.6 53.8 91.3 39.3 88.0 5 5.1 88.8 82.7 63.7 83.5 86.2 85.5 94.3

5.2 87.4 82.8 64.7 80.8 78.4 78.6 89.4

5.3 79.0 77.9 72.1 92.7 88.4 90.0 95.5

5.4 72.7 43.4 66.3 85.2 84.4 88.0 89.7

5.5 67.8 48.9 83.5 66.3 89.0

Average 82.0 75.8 65.0 87.0 81.1 86.2 93.1 Average

Competency Level

Intermediate Ability

Basic Ability


PROBLEMS: Measure 1: Articulate the philosophical and historical foundations of modern science. 1.1 Problem 2.20 A rock is tossed straight up with a velocity of 20 m/s. When it returns, it falls into a hole 10-m deep. a) What is the rock's velocity as it hits the bottom of the hole? b) How long is the rock in the air, from the instant it is released until it hits the bottom of the hole? 1.2 Problem 9.42 One billiard ball is shot east at 1.8m/s. A second, identical billiard ball is shot west at 1.0 m/s. The balls have a glancing collision, not a head-on collision, deflecting the second ball by 90°and sending it north at 1.45m/s . a) What are the speed and direction of the first ball after the collision? b) What is the direction of the first ball after the collision? Give the direction as an angle south of east. 1.3 Problem 10.4 a) What is the kinetic energy of a 1200kg car traveling at a speed of 30 m/s (~ 65 mph)? b) From what height would the car have to be dropped to have this same amount of kinetic energy just before impact? c) Does your answer to part (b) depend on the car’s mass? 1.4 Problem 12.80 A 230 g, 46.0-cm-diameter turntable rotates on frictionless bearings at 63.0 rpm. A 25.0g block sits at the center of the turntable. A compressed spring shoots the block radically outward along a frictionless groove in the surface of the turntable. What is the turntable's rotation angular velocity when the block reaches the outer edge? 1.5 Problem 14.51 It is said that Galileo discovered a basic principle of the pendulum-that the period is independent of the amplitude-by using his pulse to time the period of swinging lamps in the cathedral as they swayed in the breeze. Suppose that one oscillation of a swinging lamp takes 5.5s. a) How long is the lamp chain? b) What maximum speed does the lamp have if its maximum angle from vertical is 3.0º?

Measure 2: Understand the scientific method and demonstrate an ability to apply it across a variety of situations.

2.1 Problem 2.11 The figure shows the velocity graph of a particle moving along the x-axis. Its initial position is x0 =2 m at t0 = m. At t = 3 s, what are the particle's (a) position, (b) velocity, and (c) acceleration? 2.2 Problem 2.31 The position of a particle is given by the function x = (2t3 – 9t2 + 12) where t is in m/s. a) At what time or times is vx = 0 m/s? b) What is the particle's position at these times? c) What is the particle's acceleration at these times? 2.3 Problem 3.42 The figure shows three ropes tied together in a knot. One of your friends pulls on a rope with 3.0 units of force and another pulls on a second rope with 5.0 units of force. a) How hard must you pull on the third rope to keep the knot from moving? b) In what direction must you pull on the third rope to keep the knot from moving? 2.4 Problem 11.8 a) How much work is done by the force F = (-3.5 i - 5.0 j) N on a particle that moves through displacement Δr = - 3.3 i m? b) How much work is done by the force F = (-3.5 i - 5.0 j) N on a particle that moves through Δr = 3.3 i - 2.0 j) m? 2.5 Problem 12.40 Vector A = 5 i + 3 j and vector B = 5 i - 6 j + 4 k. a) What is the cross product A × B? Find the x-component. b) Find the y-component. c) Find the z-component.

Measure 3: Demonstrate an ability to conduct, and interpret the results of experiments aimed at better understanding natural phenomena.

3.1 Problem 2.29 A block is suspended from a spring, pulled down, and released. The block's position-versus-time graph is shown in the figure . a) At what times is the velocity zero from t = 0 to 4 s? b) At what times is the velocity most positive from t = 0 to 4 s? c) At what times is the velocity most negative from t = 0 to 4 s? 3.2 Problem 4.45 A tennis player hits a ball 2.0 m above the ground. The ball leaves his racquet with a speed of 25.0 m/s at an angle 5.5° above the horizontal. The horizontal distance to the net is 7.0 m, and the net is 1.0 m high. a) Does the ball clear the net? b) By how much? 3.3 Problem 6.15 The figure shows the velocity graph of a 77 kg passenger in an elevator. a) What is the passenger's apparent weight at t =1 s? b) What is the passenger's apparent weight at t = 5 s? c) What is the passenger's apparent weight at t = 9 s? 3.4 Problem 10.20 A student places her 430 g physics book on a frictionless table. She pushes the book against a spring, compressing the spring by 9.10 cm, then releases the book. What is the book's speed as it slides away? The spring constant is 1850 N/m . 3.5 Problem 14.35 Astronauts in space cannot weigh themselves by standing on a bathroom scale. Instead, they determine their mass by oscillating on a large spring. Suppose an astronaut attaches one end of a large spring to her belt and the other end to a hook on the wall of the space capsule. A fellow astronaut then pulls her away from the wall and releases her. The spring's length as a function of time is shown in the figure . a) What is her mass if the spring constant is 230 N/m? b) What is her speed when the spring's length is 1.2m?

Measure 4: Understand major issues and problems facing modern science and technology, including issues related to ethics, cultural values, public policies, and the impact of human activity upon the planet.

4.1 Problem 2.43 You are driving to the grocery store at 20 m/s. You are 110 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.50 s and that your car brakes with constant acceleration. a) How far are you from the intersection when you begin to apply the brakes? b) What acceleration will bring you to rest right at the intersection? c) How long does it take you to stop after the light turns red? 4.2 Problem 6.34 Seat belts and air bags save lives by reducing the forces exerted on the driver and passengers in an automobile collision. Cars are designed with a "crumple zone" in the front of the car. In the event of an impact, the passenger compartment decelerates over a distance of about 1 m as the front of the car crumples. An occupant restrained by seat belts and air bags decelerates with the car. By contrast, an unrestrained occupant keeps moving forward with no loss of speed (Newton's first law!) until hitting the dashboard or windshield. These are unyielding surfaces, and the unfortunate occupant then decelerates over a distance of only about 5 mm. a) A 60 kg person is in a head-on collision. The car's speed at impact is 20 m/s. Estimate the net force

on the person if he or she is wearing a seat belt and if the air bag deploys. b) Estimate the net force that ultimately stops the person if he or she is not restrained by a seat belt or air

bag. c) What is the force in part (a) in terms of the person's weight? d) What is the force in part (b) in terms of the person's weight? 4.3 Problem 8.8 A highway curve of radius 560 m is designed for traffic moving at a speed of 73.0 km/hr. What is the correct banking angle of the road? 4.4 Problem 9.37 Most geologists believe that the dinosaurs became extinct 65 million years ago when a large comet or asteroid struck the earth, throwing up so much dust that the sun was blocked out for a period of many months. Suppose an asteroid with a diameter of 2.0 km and a mass of 1.0×1013 kg hits the earth with an impact speed of 4.0×104 m/s. a) What is the earth's recoil speed after such a collision? (Use a reference frame in which the earth was

initially at rest.) b) What percentage is this of the earth's speed around the sun? (Use the astronomical data in the

textbook.)

4.5 Problem 11.65 In a hydroelectric dam, water falls 35.0m and then spins a turbine to generate electricity. a) What is ΔU of 1.0 kg of water? b) Suppose the dam is 80% efficient at converting the water's potential energy to electrical energy. How many kilograms of water must pass through the turbines each second to generate 45.0 MW of electricity? This is a typical value for a small hydroelectric dam.

Measure 5: Demonstrate knowledge in one area of science, including understanding its basic principles, laws, and theories.

5.1 Problem 4.16 When the moving sidewalk at the airport is broken, as it often seems to be, it takes you 50 s to walk from your gate to baggage claim. When it is working and you stand on the moving sidewalk the entire way, without walking, it takes 90 s to travel the same distance. How long will it take you to travel from the gate to baggage claim if you walk while riding on the moving sidewalk? 5.2 Problem 7.40 The coefficient of kinetic friction between the 2.0 kg block in figure and the table is 0.270. What is the acceleration of the 2.0 kg block? 5.3 Problem 9.60 The nucleus of the polonium isotope 214Po (mass 214 u) is radioactive and decays by emitting an alpha particle (a helium nucleus with mass 4 u). Laboratory experiments measure the speed of the alpha particle to be 1.91×107 m/s. Assuming the polonium nucleus was initially at rest, what is the recoil speed of the nucleus that remains after the decay? 5.4 Problem 15.64 Air flows through the tube shown in the figure. Assume that air is an ideal fluid. a) What is the air speed v1 at point 1? b) What is the air speed v2 at point 2? c) What is the volume flow rate? 5.5 Problem 21.52 A 1.0-m-tall vertical tube is filled with 20°C water. A tuning fork vibrating at 571 Hz is held just over the top of the tube as the water is slowly drained from the bottom. At what water heights, measured from the bottom of the tube, will there be a standing wave in the tube above the water?

PHYS 1600 – Engineering Physics I Spring 2013 Instructor: F Number of Students: 245 Mode of Assessment: Assignment (MasteringPhysics)

Measures Problems % Complete % Average Score % National Score 1 1.1 92.9 93.8 92.8

1.2 84.5 94.1 92.8 1.3 93.3 99.6 99.2 1.4 76.6 92.7 89.7 1.5 79.4 96.3 95.3

2 2.1 97.2 94.1 94.9 2.2 92.9 96.6 96.5 2.3 84.9 92.5 87.0 2.4 91.7 97.8 94.9 2.5 85.7 96.5 92.5

3 3.1 93.7 92.2 89.0 3.2 91.3 95.4 95.4 3.3 89.3 97.8 95.6 3.4 74.6 89.9 92.6

4 4.1 92.1 97.8 96.2 4.2 81.3 94.0 94.6 4.3 90.1 94.7 94.7 4.4 84.5 93.0 91.3 4.5 88.9 94.2 88.0

5 5.1 94.4 97.9 94.3 5.2 88.9 95.1 89.4 5.3 84.1 96.7 95.5 5.4 79.8 96.0 89.7 5.5 68.3 87.8 89.0

Average 86.7 94.9 93.0

Average Competency Level


PROBLEMS: Measure 1: Articulate the philosophical and historical foundations of modern science. 1.1 Problem 2.20 A rock is tossed straight up with a velocity of 20 m/s. When it returns, it falls into a hole 10-m deep. a) What is the rock's velocity as it hits the bottom of the hole? b) How long is the rock in the air, from the instant it is released until it hits the bottom of the hole? 1.2 Problem 9.42 One billiard ball is shot east at 1.8m/s. A second, identical billiard ball is shot west at 1.0 m/s. The balls have a glancing collision, not a head-on collision, deflecting the second ball by 90°and sending it north at 1.45m/s . a) What are the speed and direction of the first ball after the collision? b) What is the direction of the first ball after the collision? Give the direction as an angle south of east. 1.3 Problem 10.4 a) What is the kinetic energy of a 1200kg car traveling at a speed of 30 m/s (~ 65 mph)? b) From what height would the car have to be dropped to have this same amount of kinetic energy just before impact? c) Does your answer to part (b) depend on the car’s mass? 1.4 Problem 12.80 A 230 g, 46.0-cm-diameter turntable rotates on frictionless bearings at 63.0 rpm. A 25.0g block sits at the center of the turntable. A compressed spring shoots the block radically outward along a frictionless groove in the surface of the turntable. What is the turntable's rotation angular velocity when the block reaches the outer edge? 1.5 Problem 14.51 It is said that Galileo discovered a basic principle of the pendulum-that the period is independent of the amplitude-by using his pulse to time the period of swinging lamps in the cathedral as they swayed in the breeze. Suppose that one oscillation of a swinging lamp takes 5.5s. a) How long is the lamp chain? b) What maximum speed does the lamp have if its maximum angle from vertical is 3.0º?


2.1 Problem 2.11 The figure shows the velocity graph of a particle moving along the x-axis. Its initial position is x0 =2 m at t0 = m. At t = 3 s, what are the particle's (a) position, (b) velocity, and (c) acceleration? 2.2 Problem 2.31 The position of a particle is given by the function x = (2t3 – 9t2 + 12) where t is in m/s. a) At what time or times is vx = 0 m/s? b) What is the particle's position at these times? c) What is the particle's acceleration at these times? 2.3 Problem 3.42 The figure shows three ropes tied together in a knot. One of your friends pulls on a rope with 3.0 units of force and another pulls on a second rope with 5.0 units of force. a) How hard must you pull on the third rope to keep the knot from moving? b) In what direction must you pull on the third rope to keep the knot from moving? 2.4 Problem 11.8 a) How much work is done by the force F = (-3.5 i - 5.0 j) N on a particle that moves through displacement Δr = - 3.3 i m? b) How much work is done by the force F = (-3.5 i - 5.0 j) N on a particle that moves through Δr = 3.3 i - 2.0 j) m?

2.5 Problem 12.40 Vector A = 5 i + 3 j and vector B = 5 i - 6 j + 4 k. a) What is the cross product A × B? Find the x-component. b) Find the y-component. c) Find the z-component. Measure 3: Demonstrate an ability to conduct, and interpret the results of experiments

aimed at better understanding natural phenomena. 3.1 Problem 4.45 A tennis player hits a ball 2.0 m above the ground. The ball leaves his racquet with a speed of 25.0 m/s at an angle 5.5° above the horizontal. The horizontal distance to the net is 7.0 m, and the net is 1.0 m high. a) Does the ball clear the net? b) By how much? 3.2 Problem 6.15 The figure shows the velocity graph of a 77 kg passenger in an elevator. a) What is the passenger's apparent weight at t =1 s? b) What is the passenger's apparent weight at t = 5 s? c) What is the passenger's apparent weight at t = 9 s? 3.3 Problem 10.20 A student places her 430 g physics book on a frictionless table. She pushes the book against a spring, compressing the spring by 9.10 cm, then releases the book. What is the book's speed as it slides away? The spring constant is 1850 N/m . 3.4 Problem 14.35 Astronauts in space cannot weigh themselves by standing on a bathroom scale. Instead, they determine their mass by oscillating on a large spring. Suppose an astronaut attaches one end of a large spring to her belt and the other end to a hook on the wall of the space capsule. A fellow astronaut then pulls her away from the wall and releases her. The spring's length as a function of time is shown in the figure . a) What is her mass if the spring constant is 230 N/m? b) What is her speed when the spring's length is 1.2m?


4.1 Problem 2.43 You are driving to the grocery store at 20 m/s. You are 110 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.50 s and that your car brakes with constant acceleration. a) How far are you from the intersection when you begin to apply the brakes? b) What acceleration will bring you to rest right at the intersection? c) How long does it take you to stop after the light turns red? 4.2 Problem 6.34 Seat belts and air bags save lives by reducing the forces exerted on the driver and passengers in an automobile collision. Cars are designed with a "crumple zone" in the front of the car. In the event of an impact, the passenger compartment decelerates over a distance of about 1 m as the front of the car crumples. An occupant restrained by seat belts and air bags decelerates with the car. By contrast, an unrestrained occupant keeps moving forward with no loss of speed (Newton's first law!) until hitting the dashboard or windshield. These are unyielding surfaces, and the unfortunate occupant then decelerates over a distance of only about 5 mm. a) A 60 kg person is in a head-on collision. The car's speed at impact is 20 m/s. Estimate the net force

on the person if he or she is wearing a seat belt and if the air bag deploys. b) Estimate the net force that ultimately stops the person if he or she is not restrained by a seat belt or air

bag. c) What is the force in part (a) in terms of the person's weight? d) What is the force in part (b) in terms of the person's weight? 4.3 Problem 8.8 A highway curve of radius 560 m is designed for traffic moving at a speed of 73.0 km/hr. What is the correct banking angle of the road? 4.4 Problem 9.37 Most geologists believe that the dinosaurs became extinct 65 million years ago when a large comet or asteroid struck the earth, throwing up so much dust that the sun was blocked out for a period of many months. Suppose an asteroid with a diameter of 2.0 km and a mass of 1.0×1013 kg hits the earth with an impact speed of 4.0×104 m/s. a) What is the earth's recoil speed after such a collision? (Use a reference frame in which the earth was

initially at rest.) b) What percentage is this of the earth's speed around the sun? (Use the astronomical data in the

textbook.)

4.5 Problem 11.65 In a hydroelectric dam, water falls 35.0m and then spins a turbine to generate electricity. a) What is ΔU of 1.0 kg of water? b) Suppose the dam is 80% efficient at converting the water's potential energy to electrical energy. How many kilograms of water must pass through the turbines each second to generate 45.0 MW of electricity? This is a typical value for a small hydroelectric dam.


5.1 Problem 4.16 When the moving sidewalk at the airport is broken, as it often seems to be, it takes you 50 s to walk from your gate to baggage claim. When it is working and you stand on the moving sidewalk the entire way, without walking, it takes 90 s to travel the same distance. How long will it take you to travel from the gate to baggage claim if you walk while riding on the moving sidewalk? 5.2 Problem 7.40 The coefficient of kinetic friction between the 2.0 kg block in figure and the table is 0.270. What is the acceleration of the 2.0 kg block? 5.3 Problem 9.60 The nucleus of the polonium isotope 214Po (mass 214 u) is radioactive and decays by emitting an alpha particle (a helium nucleus with mass 4 u). Laboratory experiments measure the speed of the alpha particle to be 1.91×107 m/s. Assuming the polonium nucleus was initially at rest, what is the recoil speed of the nucleus that remains after the decay? 5.4 Problem 15.64 Air flows through the tube shown in the figure. Assume that air is an ideal fluid. a) What is the air speed v1 at point 1? b) What is the air speed v2 at point 2? c) What is the volume flow rate?

5.5 Problem 21.52 A 1.0-m-tall vertical tube is filled with 20°C water. A tuning fork vibrating at 571 Hz is held just over the top of the tube as the water is slowly drained from the bottom. At what water heights, measured from the bottom of the tube, will there be a standing wave in the tube above the water?

PHYS 1610

ENGINEERING PHYSICS II

PHYS 1610 – Engineering Physics II Fall 2012 Instructors: I, L, J Number of Students: 126 (I), 73 (L), 145 (J) Mode of Assessment: Assignment (MasteringPhysics)

Measures Problems % Complete % Average Score %

National Score

Instructor I

Instructor L

Instructor J

Instructor I

Instructor L

Instructor J

1 1.1 88.8 87.7 94.6 93.8 91.92 1.2 90.4 93.2 77.3 99.1 100 99.2 95.47 1.3 92.2 92.6 94.89 1.4 90.9 95.0 97.80 1.5 81.8 93.7 92.78

2 2.1 90.9 91.4 94.48 2.2 85.1 93.5 97.79 2.3 82.4 86.3 77.9 90.8 91.3 95.8 95.23 2.4 86.4 84.9 75.3 98.1 96.8 94.8 87.88

3 3.1 89.6 86.3 98.2 98.4 92.78 3.2 86.4 86.3 77.3 96.3 98.4 99.2 97.49 3.3 73.4 94.7 86.56 3.4 84.8 79.5 75.3 89.6 94.8 94.8 91.83 3.5 85.6 87.7 80.5 98.1 97.7 97.6 97.68

4 4.1 87.2 86.3 98.2 98.4 94.89 4.2 71.2 78.1 85.1 97.8 96.5 100 95.15 4.3 66.4 37 77.3 94 90.7 96.6 92.42 4.4 94.4 90.4 83.1 97.5 100 99.2 99.92 4.5 83.2 79.5 76.6 96.2 96.6 94.9 96.77

5 5.1 68.8 78.1 80.5 97.1 96.5 96.0 88.76 5.2 82.5 94.0 91.25 5.3 83.8 90.7 99.63 5.4 88.8 87.7 79.2 95.5 96.9 95.9 92.72

Average 83.6 81.9 81.3 96.1 96.5 95.48 94.29 Average

Competency Level Intermediate Ability

PROBLEMS: Measure 1: Articulate the philosophical and historical foundations of modern science. 1.1 A 20-cm-diameter cylinder that is 40 cm long contains 50 g of oxygen gas at 20 ºC. a) How many moles of oxygen are in the cylinder? b) How many oxygen molecules are in the cylinder? c) What is the number density of the oxygen? d) What is the reading of a pressure gauge attached to the tank? 1.2 Light from a sodium lamp (λ = 589nm) illuminates two narrow slits. The fringe spacing on a screen 150cm behind the slits is 4.0 mm. What is the spacing (in mm) between the two slits? 1.3 A plastic rod that has been charged to -18 nC touches a metal sphere. Afterward, the rod's charge is -9.0 nC. a) What kind of charged particle was transferred between the rod and the sphere, and in which direction?

That is, did it move from the rod to the sphere or from the sphere to the rod? b) How many charged particles were transferred? 1.4 What is the net electric force on charge A in the figure? 1.5 In a classical model of the hydrogen atom, the electron orbits the proton in a circular orbit of radius 0.053nm. What is the orbital frequency? The proton is so much more massive than the electron that you can assume the proton is at rest. Measure 2: Understand the scientific method and demonstrate an ability to apply it

across a variety of situations. 2.1 a) What is the magnitude of the force F on the 1.0 nC charge in the figure ? b) What is the direction of the force F on the 1.0 nC charge in the figure?

2.2 Charge Q is uniformly distributed along a thin, flexible rod of length L. The rod is then bent into the semicircle shown in the figure. a) Find an expression for the electric field E at the center of the semicircle. b) Evaluate the field strength if L = 10cm and Q = 30nC. 2.3 A proton moves in the magnetic field B = 0.50i T with a speed of 1.0 × 107m/s in the directions shown in the figure. For each, what is magnetic force F on the proton? a) Express vector F in the form Fx, Fy, Fz, where the x, y, and z components are separated by commas. b) Express vector F in the form Fx, Fy, Fz, where the x, y, and z components are separated by commas. 2.4 A 40-turn, 4.0-cm-diameter coil with R = 0.40Ω surrounds a 3.0-cm-diameter solenoid. The solenoid is 20 cm long and has 200 turns. The 60Hz current through the solenoid is I = Io sin(2πft). What is Io if the maximum induced current in the coil is 0.20A? Measure 3: Demonstrate an ability to conduct, and interpret the results of experiments

aimed at better understanding natural phenomena. 3.1 The solar corona is a very hot atmosphere surrounding the visible surface of the sun. X-ray emissions from the corona show that its temperature is about 2×106 K. The gas pressure in the corona is about 0.03 Pa. Estimate the number density of particles in the solar corona. 3.2 The wings of some beetles have closely spaced parallel lines of melanin, causing the wing to act as a reflection grating. Suppose sunlight shines straight onto a beetle wing. If the melanin lines on the wing are spaced 2.8 μm apart, what is the first-order diffraction angle for green light (λ = 550 nm)?

3.3 The figure is an edge view of three charged metal electrodes. Draw a graph of V versus x over the region 0 x 3 cm. Hint: Assume that V = 0 V at x = 0 cm. 3.4 A 90μF capacitor that had been charged to 30V is discharged through a resistor. The figure shows the capacitor voltage as a function of time. What is the value of the resistance?

3.5 The aurora is caused when electrons and protons, moving in the earth's magnetic field of ≈ 5×10-5 T, collide with molecules of the atmosphere and cause them to glow. a) What is the radius of the cyclotron orbit for an electron with speed 1.0 × 106 m/s? b) What is the radius of the cyclotron orbit for a proton with speed 5.0 × 104 m/s? Measure 4: Understand major issues and problems facing modern science and

technology, including issues related to ethics, cultural values, public policies, and the impact of human activity upon the planet.

4.1 On average, each person in the industrialized world is responsible for the emission of 10,000 kg of carbon dioxide CO2 every year. This includes CO2 that you generate directly, by burning fossil fuels to operate your car or your furnace, as well as CO2 generated on your behalf by electric generating stations and manufacturing plants. CO2 is a greenhouse gas that contributes to global warming. If you were to store your yearly CO2 emissions in a cube at STP, how long would each edge of the cube be? 4.2 A typical nuclear reactor generates 1000MW (1000 MJ/s) of electrical energy. In doing so, it produces 2000MW of "waste heat" that must be removed from the reactor to keep it from melting down. Many reactors are sited next to large bodies of water so that they can use the water for cooling. Consider a reactor where the intake water is at 18 ºC. State regulations limit the temperature of the output water to 30ºC so as not to harm aquatic organisms. How many liters of cooling water have to be pumped through the reactor each minute?

4.3 A typical coal-fired power plant burns 350 metric tons of coal every hour to generate 750MW of electricity. 1 metric ton = 1000 kg. The density of coal is 1500 kg/m3 and its heat of combustion is 28MJ/kg. Assume that all heat is transferred from the fuel to the boiler and that all the work done in spinning the turbine is transformed into electrical energy. a) Suppose the coal is piled up in a 9.00m × 11.0m room. How tall must the pile be to operate the plant

for one day? b) What is the power plant's thermal efficiency? 4.4 Energy experts tell us to replace regular incandescent lightbulbs with compact fluorescent bulbs, but it seems hard to justify spending $15 on a lightbulb. A 60W incandescent bulb costs 50 cents. and has a lifetime of 1000 hours. A 15 W compact fluorescent bulb produces the same amount of light as a 60W incandescent bulb and is intended as a replacement. It costs $15 and has a lifetime of 10,000 hours. Compare the life-cycle costs of 60W incandescent bulbs to 15W compact fluorescent bulbs. The life-cycle cost of an object is the cost of purchasing it plus the cost of fueling and maintaining it over its useful life. Which is the cheaper source of light and which the more expensive? Assume that electricity costs 0.10 dollars/kWh. 4.5 One possible concern with MRI (magnetic resonance imaging) is turning the magnetic field on or off too quickly. Bodily fluids are conductors, and a changing magnetic field could cause electric currents to flow through the patient. Suppose a typical patient has a maximum cross-section area of 6.7×10−2 m2. What is the smallest time interval in which a 5.6T magnetic field can be turned on or off if the induced emf around the patient's body must be kept to less than 0.12V? Measure 5: Demonstrate knowledge in one area of science, including understanding its

basic principles, laws, and theories. 5.1 A monatomic gas follows the process 1→2→3shown in the figure. a) How much heat is needed for process 1→2? b) How much heat is needed for process 2→3? 5.2 A spherically symmetric charge distribution produces the electric field E = (4900 r2) er N/C, where r is in m. a) What is the electric field strength at r = 25.0 cm? b) What is the electric flux through a 38.0-cm-diameter spherical surface that is concentric with the

charge distribution? c) How much charge is inside this 38.0-cm-diameter spherical surface?

5.3 A -2.0nC charge and a 2.0nC charge are located on the x-axis at x = -1.0cm and x = +1.0cm, respectively. a) At what position or positions on the x -axis is the electric field zero? b) At what position or positions on the x -axis is the electric potential zero? 5.4 What power is dissipated by the 2Ω resistor in the figure?

PHYS 1610 – Engineering Physics II Spring 2013 Instructor: I Number of Students: 217 Mode of Assessment: Assignment (MasteringPhysics)

Measures Problems %

Complete %

Average Score % National

Score

1

1.1 77.5 85.8 91.92 1.2 79.7 99.4 95.47 1.3 94.3 88.1 94.89 1.4 86.8 76.6 97.80 1.5 79.7 93.7 92.78

2 2.1 89.9 90.4 94.48 2.2 84.6 82.0 97.79 2.3 75.8 89.2 95.23

3

3.1 84.1 96.9 92.78 3.2 80.2 99.5 97.49 3.3 82.8 95.5 96.90 3.4 78.9 87.2 91.83 3.5 70.0 87.1 91.23

4 4.1 89.9 98.0 94.89 4.2 76.7 96.6 95.15 4.3 86.8 95.4 92.42

5

5.1 88.1 93.1 91.25 5.2 81.1 84.8 93.51 5.3 78.4 89.8 94.90 5.4 74.9 77.1 92.72

Average 82.0 90.3 94.27 Average

Competency Level


PROBLEMS: Measure 1: Articulate the philosophical and historical foundations of modern science. 1.1 A 20-cm-diameter cylinder that is 40 cm long contains 50 g of oxygen gas at 20 ºC. a) How many moles of oxygen are in the cylinder? b) How many oxygen molecules are in the cylinder? c) What is the number density of the oxygen? d) What is the reading of a pressure gauge attached to the tank? 1.2 Light from a sodium lamp (λ = 589nm) illuminates two narrow slits. The fringe spacing on a screen 150cm behind the slits is 4.0 mm. What is the spacing (in mm) between the two slits? 1.3 A plastic rod that has been charged to -18 nC touches a metal sphere. Afterward, the rod's charge is -9.0 nC. a) What kind of charged particle was transferred between the rod and the sphere, and in which direction?

That is, did it move from the rod to the sphere or from the sphere to the rod? b) How many charged particles were transferred? 1.4 What is the net electric force on charge A in the figure? 1.5 In a classical model of the hydrogen atom, the electron orbits the proton in a circular orbit of radius 0.053nm. What is the orbital frequency? The proton is so much more massive than the electron that you can assume the proton is at rest. Measure 2: Understand the scientific method and demonstrate an ability to apply it

across a variety of situations. 2.1 a) What is the magnitude of the force F on the 1.0 nC charge in the figure ? b) What is the direction of the force F on the 1.0 nC charge in the figure?

2.2 Charge Q is uniformly distributed along a thin, flexible rod of length L. The rod is then bent into the semicircle shown in the figure. a) Find an expression for the electric field E at the center of the semicircle. b) Evaluate the field strength if L = 10cm and Q = 30nC. 2.3 A proton moves in the magnetic field B = 0.50i T with a speed of 1.0 × 107m/s in the directions shown in the figure. For each, what is magnetic force F on the proton? a) Express vector F in the form Fx, Fy, Fz, where the x, y, and z components are separated by commas. b) Express vector F in the form Fx, Fy, Fz, where the x, y, and z components are separated by commas. Measure 3: Demonstrate an ability to conduct, and interpret the results of experiments

aimed at better understanding natural phenomena. 3.1 The solar corona is a very hot atmosphere surrounding the visible surface of the sun. X-ray emissions from the corona show that its temperature is about 2×106 K. The gas pressure in the corona is about 0.03 Pa. Estimate the number density of particles in the solar corona. 3.2 The wings of some beetles have closely spaced parallel lines of melanin, causing the wing to act as a reflection grating. Suppose sunlight shines straight onto a beetle wing. If the melanin lines on the wing are spaced 2.8 μm apart, what is the first-order diffraction angle for green light (λ = 550 nm)? 3.3 (p30.62) A 1.5 V flashlight battery is connected to a wire with a resistance of 3.00 Ω. The figure shows the battery's potential difference as a function of time. (a) What is the total charge lifted by the charge escalator?

3.4 A 90μF capacitor that had been charged to 30V is discharged through a resistor. The figure shows the capacitor voltage as a function of time. What is the value of the resistance?

3.5 The heart produces a weak magnetic field that can be used to diagnose certain heart problems. It is a dipole field produced by a current loop in the outer layers of the heart. (a) It is estimated that the field at the center of the heart is 100 pT. What current must circulate around an

8.0-cm-diameter loop, about the size of a human heart, to produce this field? (b) What is the magnitude of the heart's magnetic dipole moment? Measure 4: Understand major issues and problems facing modern science and


4.1 On average, each person in the industrialized world is responsible for the emission of 10,000 kg of carbon dioxide CO2 every year. This includes CO2 that you generate directly, by burning fossil fuels to operate your car or your furnace, as well as CO2 generated on your behalf by electric generating stations and manufacturing plants. CO2 is a greenhouse gas that contributes to global warming. If you were to store your yearly CO2 emissions in a cube at STP, how long would each edge of the cube be? 4.2 A typical nuclear reactor generates 1000MW (1000 MJ/s) of electrical energy. In doing so, it produces 2000MW of "waste heat" that must be removed from the reactor to keep it from melting down. Many reactors are sited next to large bodies of water so that they can use the water for cooling. Consider a reactor where the intake water is at 18 ºC. State regulations limit the temperature of the output water to 30ºC so as not to harm aquatic organisms. How many liters of cooling water have to be pumped through the reactor each minute? 4.3 A refrigerator has a P compressor, but the compressor runs only N % of the time. (a) If electricity costs pr, what is the monthly (30 day) cost of running the refrigerator? (b) A more energy-efficient refrigerator with an P_eff compressor costs...


5.1 A spherically symmetric charge distribution produces the electric field E = (4900 r2) er N/C, where r is in m. a) What is the electric field strength at r = 25.0 cm? b) What is the electric flux through a 38.0-cm-diameter spherical surface that is concentric with the

charge distribution? c) How much charge is inside this 38.0-cm-diameter spherical surface? 5.2 The electric potential at the dot in the figure is 3320 V. What is charge q? 5.3 Two 5.0 × 5.0 cm metal electrodes are spaced 1.2 mm apart and connected by wires to the terminals of a 9.0 V battery. (a) What is the charge on each electrode? (b) What is the potential difference between electrodes? (c) The wires are disconnected, and insulated handles are used to pull the plates apart to a new spacing of

2.4mm. What is the charge on each electrode? (d) What is the potential difference between electrodes? 5.4 What power is dissipated by the 2Ω resistor in the figure?

PHYS 1610 – Engineering Physics II Spring 2013 Instructor: J Number of Students: 162 Mode of Assessment: Assignment (MasteringPhysics)

Measures Problems %

Complete %

Average Score % National

Score

1

1.1 77.3 99.2 96.27 1.2 92.2 92.6 91.78 1.3 90.9 95.0 95.00 1.4 81.8 93.7 81.52

2

2.1 90.9 91.4 80.69 2.2 85.1 93.5 99.58 2.3 77.9 95.8 95.85 2.4 75.3 94.8 94.13

3

3.1 77.3 99.2 94.10 3.2 73.4 94.7 90.61 3.3 75.3 94.8 92.23 3.4 80.5 97.6 95.00

4 4.1 85.1 100 90.20 4.2 77.3 96.6 93.75 4.3 83.1 99.2 91.23

5

5.1 80.5 96.0 87.45 5.2 82.5 94.0 85.50 5.3 83.8 90.7 92.57 5.5 79.2 95.9 92.70

Average 81.5 95.5 91.59 Average

Competency Level Intermediate Ability

PROBLEMS: Measure 1: Articulate the philosophical and historical foundations of modern science. 1.1 Problem 22.6 Light from a sodium lamp (λ = 589 nm) illuminates two narrow slits. The fringe spacing on a screen 150cm behind the slits is 4.0 mm. What is the spacing (in mm) between the two slits? 1.2 Problem 26.3 a) What is the strength of the electric field at the position indicated by the dot in the figure? b) What is the direction of the electric field at the position indicated by the dot in the figure? (Assume

that x-axis is horizontal and points to the right.)

1.3 Problem 26.16 A 16 cm × 16 cm horizontal metal electrode is uniformly charged to +48 nC. What is the electric field strength 2.0 mm above the center of the electrode? 1.4 Problem 27.58 A sphere of radius R has total charge Q. The volume charge density (C/m3) within the sphere is This charge density decreases linearly from ρ0 at the center to zero at the edge of the sphere. a) Show that: b) Show that the electric field inside the sphere points radially outward with magnitude c) Show that your result of part (b) has the expected value at r = R.


2.1 Problem 26.37 The figure is a cross section of two infinite lines of charge that extend out of the page. The linear charge densities are ± λ. Find an expression for the electric field strength E at height y above the midpoint between the lines. 2.2 Problem 27.46 A uniformly charged ball of radius a and charge –Q is at the center of a hollow metal shell with inner radius b and outer radius c. The hollow sphere has net charge +5Q. a) Determine the electric field strength in the region r ≤ a. b) Determine the electric field strength in the region a < r < b . c) Determine the electric field strength in the region b ≤ r ≤ c. 2.3 Problem 33.26 At t = 0 s, the current in the circuit in the figure is I0. At what time is the current ½I0?

2.4 Problem 34.44 Assume that a 7.0-cm-diameter, 120 W light bulb radiates all its energy as a single wavelength of visible light. a) Estimate the electric field strength at the surface of the bulb. b) Estimate the magnetic field strength at the surface of the bulb.

Measure 3: Demonstrate an ability to conduct, and interpret the results of experiments aimed at better understanding natural phenomena.

3.1 Problem 22.48 Light from a sodium lamp (λ = 589nm) illuminates a narrow slit and is observed on a screen 88.0 cm behind the slit. The distance between the first and third dark fringes is 2.70 mm . What is the width (in mm) of the slit? 3.2 Problem 30.41 The following figure shows a 4.0-cm-wide plastic film being wrapped onto a 2.0-cm-diameter roller that turns at 90 rpm . The plastic has a uniform surface charge density of -2.1 nC/m2 . a) What is the current of the moving film? b) How long does it take the roller to accumulate a charge of -10 µC? 3.3 Problem 32.71 In the following figure, a long, straight, current-carrying wire of linear mass density µ is suspended by threads. A magnetic field perpendicular to the wire exerts a horizontal force that deflects the wire to an equilibrium angle θ. a) Find an expression for the strength and direction of the magnetic field B. b) What B deflects a 60 g/m wire to a 15° angle when the current is 10 A? c) What is the direction of B? 3.4 Problem 33.30 A 100-turn, 2.0-cm-diameter coil is at rest in a horizontal plane. A uniform magnetic field 60° away from vertical increases from 0.50 T to 2.5 T in 0.50 s. What is the induced emf in the coil?


4.1 Problem 17.46 Your 300 ml cup of coffee is too hot to drink when served at 86.0°C. What is the mass of an ice cube, taken from a -17.0°C freezer, that will cool your coffee to a pleasant 57.0°? 4.2 Problem 19.47 A typical coal-fired power plant burns 350 metric tons of coal every hour to generate 750MW of electricity. 1 metric ton = 1000 kg. The density of coal is 1500 kg/m3 and its heat of combustion is 28MJ/kg. Assume that all heat is transferred from the fuel to the boiler and that all the work done in spinning the turbine is transformed into electrical energy. a) Suppose the coal is piled up in a 9.00m × 11.0m room. How tall must the pile be to operate the plant

for one day? b) What is the power plant's thermal efficiency? 4.3 Problem 32.53 The heart produces a weak magnetic field that can be used to diagnose certain heart problems. It is a dipole field produced by a current loop in the outer layers of the heart. a) It is estimated that the field at the center of the heart is 100 pT. What current must circulate around an

8.0-cm-diameter loop, about the size of a human heart, to produce this field? b) What is the magnitude of the heart's magnetic dipole moment? Measure 5: Demonstrate knowledge in one area of science, including understanding its basic

principles, laws, and theories. 5.1 Problem 17.62 Two cylinders each contain 0.20 mol of a diatomic gas at 350 K and a pressure of 3.0 atm. Cylinder A expands isothermally and cylinder B expands adiabatically until the pressure of each is 1.0 atm. a) What is the final temperature of the gas in the cylinder A? b) What are the final temperature of the gas in the cylinder B? c) What is the final volume of the gas in the cylinder A? d) What is the final volume of the gas in the cylinder B? 5.2 Problem 28.35 A -3.6 nC charge is on the x-axis at x1= -7 cm and a 4.4nC charge is on the x-axis at x2 = 13 cm. At what point or points on the y-axis is the electric potential zero? 5.3 Problem 29.36 An infinitely long cylinder of radius R has linear charge density λ. The potential on the surface of the cylinder is V0, and the electric field outside the cylinder is:

5.4 Problem 32.66 A Hall-effect probe to measure magnetic field strengths needs to be calibrated in a known magnetic field. Although it is not easy to do, magnetic fields can be precisely measured by measuring the cyclotron frequency of protons. A testing laboratory adjusts a magnetic field until the proton's cyclotron frequency is 10.5 MHz. At this field strength, the Hall voltage on the probe is 0.541 mV when the current through the probe is 0.159 mA. Later, when an unknown magnetic field is measured, the Hall voltage at the same current is 1.736 mV. What is the strength of this magnetic field?

PHYS 1617

HONORS PHYSICS II

PHYS 1617 – Honors Physics II Spring 2013 Instructor: M Number of Students: 24 Mode of Assessment: Exam

Measures Problems % Average Score 1 1.1 71 1 1.2 38 1 1.3 58 2 2.1 71 2 2.2 71 2 2.3 83 2 2.4 50 3 3.1 96 3 3.2 88 3 3.3 83 3 3.4 71 3 3.5 13 4 4.1 83 4 4.2 83 4 4.3 92 4 4.4 83 5 5.1 67 5 5.2 71 5 5.3 63 5 5.4 67 5 5.5 92

Average 71

Average Competency Level Intermediate Ability

PROBLEMS: 1. Articulate the philosophical and historical foundations of modern science 1.1 An unmagnetized metal sphere hangs by a thread. When the north pole of a bar

magnet is brought near, the sphere is strongly attracted to the magnet. Then the magnet is reversed and its south pole is brought near the sphere. How does the sphere respond?

a. It is strongly attracted to the magnet. b. It is weakly attracted to the magnet. c. It does not respond. d. It is weakly repelled by the magnet. e. It is strongly repelled by the magnet.

1.2 An electron in the beam of a TV picture tube is accelerated by a potential

difference of 2.00 kV. Then it passes through a region of transverse magnetic field, where it moves in a circular arc with radius 0.180 m. What is the magnitude of the field?

a. 1.20 x 10-5 T b. 2.65 x 10-5 T c. 2.65 x 10-4 T d. 8.34 x 10-4 T e. 9.24 x 10-4 T

1.3 Lightofwavelength500nminairentersaglassblockwithindexof

refraction,n=1.5.Whenthelightenterstheblock,whichofthefollowingpropertiesofthelightwillnotchange?

a. Thespeedofthelightb. Thefrequencyoflightc. Thewavelengthofthelight

2. Understand the scientific method and demonstrate an ability to apply it

across a variety of situations. 2.1 An ice-cube tray of negligible mass contains 0.350 kg of water at 18.0C. How

much heat must be removed to cool the water to 0.00C and freeze it? a. 34.2 kJ b. 90.5 kJ c. 104 kJ d. 130 kJ e. 143 kJ

2.2 In a gas at STP, what is the length of the side of a cube that contains a number of molecules equal to the population of the earth (about 6 billion people)?

a. 0.61 m b. 2.6 m c. 3.9 m d. 6.1 m e. 22.4 m

2.3 A gas undergoes two processes. In the first, the volume remains constant at 0.200

m3 and the pressure increases from 2.00 x 105 Pa to 5.00 x 105 Pa. The second process is a compression to a volume of 0.120 m3 at a constant pressure of 5.00 x 105 Pa. Find the total work done by the gas during both processes.

a. – 40 kJ b. – 16 kJ c. 0.0 kJ d. 16 kJ e. 40 kJ

2.4 Anobjectis50cmfromadiverginglenswithafocallengthof‐20cm.Howfarfromthelensistheimage,andwhichsideofthelensisiton?

a. 14cm,onthesamesideastheobject b. 14cm,ontheoppositesidefromtheobject c. 30cm,onthesamesideastheobject d. 33cm,onthesamesideastheobject e. 33cm,ontheoppositesidefromtheobject

3. Demonstrate an ability to conduct, and interpret the results of experiments

aimed at better understanding natural phenomena. The next three questions all use the same set up below: A 75-kg person holds out his arms so that his hands are 1.7 m apart. Typically, a

person’s hand makes up about 1.0% of his or her body weight. For round numbers, we shall assume that all the weight of each hand is due to the calcium in the bones, and we shall treat the hands as point charges. One mole of Ca contains 40.18 g and each atom has 20 protons and 20 electrons. Suppose that only 1.0% of the positive charges in each hand were unbalanced by negative charge.

3.1 How many Ca atoms does each hand contain?

a. 1.12 x 1025 atoms b. 2.31 x 1025 atoms c. 6.02 x 1025 atoms d. 7.82 x 1025 atoms e. 9.13 x 1025 atoms

3.2 How many coulombs of unbalanced charge does each hand contain? a. 1.1 x 105 C b. 1.8 x 105 C c. 3.6 x 105 C d. 4.0 x 105 C e. 9.6 x 105 C

3.3 What force would the person’s arms have to exert on his hands to prevent them from flying off?

a. 1.0 x 1020 N b. 4.0 x 1020 N c. 5.0 x 1020 N d. 1.6 x 1021 N e. 2.9 x 1021 N

3.4 Whatdiametermustacopperwirehaveifitsresistanceistobethesameasthatofanequallengthofaluminumwirewithdiameter3.26mm?(al=2.63x10‐8m,c=1.72x10‐8m)

a. 2.14mmb. 2.64mmc. 3.26mmd. 4.03mme. 6.93mm

3.5 Astereoamplifiercreatesa5.0Vpotentialdifferenceacrossaspeaker.To

doublethepoweroutputofthespeaker,theamplifier’spotentialdifferencemustbeincreasedto

a. 7.1Vb. 10Vc. 14Vd. 25Ve. 31V

4. Understand major issues and problems facing modern science and


4.1 If the air temperature is the same as the temperature of your skin (~ 30C) your

body cannot get rid of heat by transferring it to the air. In that case, it gets rid of the heat by evaporating water (sweat). During bicycling, a typical 70-kg person’s body produces energy at a rate of about 500 W due to metabolism, 80% of which is converted to heat. How many kilograms of water must the person’s boy evaporate in an hour to get rid of this heat? The heat of vaporization of water at body temperature is 2.42 x 106 J/kg.

a. 0.01 kg b. 0.34 kg c. 0.60 kg d. 0.74 kg e. 4.32 kg

The next three questions all use the same set up below:

Electric Fields in an Atom. The nuclei of large atoms, such as uranium, with 92 protons, can be modeled as spherically symmetric spheres of charge. The radius of the uranium nucleus is approximately 7.4 x 10-15 m.

4.2 Whatistheelectricfieldthisnucleusproducesjustoutsideitssurface?

a. 0N/Cb. 2.4x1021N/Cc. 3.1x1021N/Cd. 6.1x1021N/Ce. 1.2x1022N/C

4.3 Whatmagnitudeofelectricfielddoesitproduceatthedistanceofthe

electrons,whichisabout1.0x10‐10m?a. 4.5x1012N/Cb. 1.3x1013N/Cc. 3.3x1013N/Cd. 7.2x1013N/Ce. 3.2x1015N/C

4.4 Theelectronscanbemodeledasformingauniformshellofnegativecharge.

Whatnetelectricfielddotheyproduceatthelocationofthenucleus?a. 0N/Cb. 2.4x1021N/Cc. 3.1x1021N/Cd. 6.1x1021N/Ce. 1.2x1022N/C

5. Demonstrate knowledge in one area of science, including understanding its basic principles, laws, and theories.

5.1 How much work is needed to assemble an atomic nucleus containing three

protons (such as Be) if we model it as an equilateral triangle of side 2.00 x 10-15 m with a proton at each vertex? Assume the protons started from very far away.

a. 0 J b. 1.14 x 10-13 J c. 2.31 x 10-13 J d. 3.46 x 10-13 J e. 4.60 x 10-13 J

5.2 At a certain distance from a point charge, the potential and electric field

magnitude due to that charge are 4.98 V and 12.0 V/m respectively. Take V = 0 at infinity. What is the magnitude of the charge?

a. 0.07 nC b. 0.17 nC c. 0.23 nC d. 0.27 nC e. 0.42 nC

The next three questions all use the same set up below:

A 5.00 pF, parallel-plate, air-filled capacitor with circular plates is to be used in a circuit in which it will be subjected to potentials of up to 1.00 x 102 V. The electric field between the plates is to be no greater than 1.00 x 104 N/C.

5.3 Whatshouldbetheradiusofeachplate?

a. 4.2mmb. 5.7mmc. 2.1cmd. 4.2cme. 5.7cm

5.4 Whatshouldbethespacingofthecapacitor?

a. 1.0cmb. 1.9cmc. 2.2cmd. 3.1cme. 5.0cm

5.5 Whatisthemaximumchargetheyshouldhold?

a. 63pCb. 125pCc. 250pCd. 500pC

Documents

Core Curriculum Assessment Report Feb2013 - …ous.auburn.edu/wp-content/uploads/core/2012-13-cc-reports/2012-13...Core Curriculum Assessment Report 2012‐2013 ... closer to a formal