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fizika eksterno 8/9
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e::
?
?:gr (),dg (), kg (), t ()
?:
SI :: (,,,, , , )
:: 1000Kg, 10 000dg, 1 000 000gr
::l ()
::
?:
:: 60 =3600
, , : =/
1 ,
1 .:2000
::
::
::
::
20 .
5 ?: 5 20=100 =1 40
:
: =/
0.1 km, 40 m.
?:=0.1m40m=100m40m=4000m2
, ::
::
:: ,
:: ,
1 ::1000gr
5 kg ,
, ::Te 6 , 8.1245N , 49,05N
20 kg, 5%?
g = 10 m/s2 .:=Fn=200N =5
:: ( )
,
?:
::F
::
,
, ?:
,
?: ,
?:m/s2 ( )
SI ::m/s ( )
,
, :: (s- , -, t-)
:
:
::
::
::
1 kg
::1m/s2( )
::
::
, ::
a = v/t. v?:
,
2 m/s. ?:
18 km/h,
m/s?:
4 h
50 km/h?:
N () 5 kN ()?
: 5000N
2 kg
5 m/s2?:
?
:
.
,
::
:: . .
:: ()
?
:
:
:
::
?:
,
::
,
::
:: (A-, F-,s- )
1000 kW,
?:1MW
20 kg
1 ?:
2 kJ 2 m :
:
?: (m-, g- , h- )
5 g 10 m?:
::
0,2 kW.
?: 1kW= 1000W 0,2kW=0,2 1000W=200W
10 J, 7 J,
::== 0,7
8 kW. 16
m 1 h.
1000 kg/m3. (g=10 m/s2):
500 5 s. ?
:
1s 4 m3 25
m. 1000 kg/m3.
? (g=9,81 m/s2):
h ,
::
50 kg . 10 .
? (g=10m/s2):
1 kg
1 ?:
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SI :: 1
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,
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:: ,
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?:???
5 ::
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,
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70.
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::273,15
Q, J,
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100 ::
-25 95?: 120
:: : ,t
1
kg 20 100 ? ( c =
4200 J / kgK):
10 g
500m/s, 300 m/s.
?:
m t
:: , c-
:: ???
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SI :: 1s ,
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?: 4
e 100 kg,
:
::
::
:: 1Pa
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20 ?:
:: .
?: . . , .
4
m/s2. 72 km/h?:
:: A
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.
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.
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(), ,
::1W ()
::
1W?
: ( )
::
.
. ?:
?:
::
?:
420 dm3
e ::
::
10C 1.:???
0,5m3:: 1l=1dm3 = 0.001m3 , 0,5m3=500l
: :
::
100 90 .
::1,5
84
?:
e ?:
30 cm3 30 cm3 ,
?:
,
:
?:Ka (, ,), .
. ?:
420dm3, e
::
60 kg.
?:
1cm3 e 200 cm3 .
,
250 cm3. ?: 250cm3-200cm3=50cm3
::
:
: -1N
:: m/s ( )
?:????
::
, ::
F = x, x :: x-
::
::
(F), (m)
(a)?: ,
36 km/h, 10
m/s. .: ,
?:
5 .
km/h :: 5m/h
::
::
F = kx :
5 N, 2 N 4 N .
:: F=5+2+4=11 N
.
? :3-4 ( )
. ? :
5 kg,
0,5,
g = 10m/s2?:
, :: g=9,81m/s2
?: =
::
?:
::???
40, 60, 75 100 W.
?: 100W
100 , 200
. ::
::
1 N, 1 m,
:: ,
20N
20 m. ?:
100 J,
50 N. ?: :
::
(
), ::
, ?:
10 , 8 ,
::
, ,
2000 J 2s. ?:
,
50 kg 2 m/s?:
,
::
. ?
:
::
?:
SI :
:
:: -273,15
:
:
:
:
:
:
::
m
, ::
?: 1m 1
4 ::
::
, .
::
( ) ::
37 .
( ):
, ,
. . ?: , .
::