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Problema de mecánica de materiales
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E.E.EΣM A=0; (.95lb) (6in)-R2(16in) + (.55lb) (21in)=0
(16in)R2= (.95lb) (6in) + (.55lb) (21in)
(16in)R2= 17.25lb/in
R2=17.25lb /¿16∈¿¿ = 1.07lb
ΣFy=0 ; R1- .95lb + 1.07lb-.55lb=0r1= .95lb-1.07lb+.55lbR1= .43lb
1era sección 0< x <6
X o ΣFy= .43 – v=0 v M V= .43
ΣM o−o=0; 0.43(X) – M =0 o M = 0.43 (x) R1=0.43lb2da sección 6 < x < 16 ΣFy= .43 - .95 – v=0 V= .43 - .95
Σ M o−o=0 ; .43(x) – 0.95(x – 6) - M
M = 0.43(x) – 0.95(x-6)
3ra sección 16 < x < 21 V ΣFy=0; 0.43 – 0.95 + 1.07 – v= 0 V = .43 – 0.95+ 1.07
ΣM o−o=0; .43 (x) – 0.95 (x-6) + 1.07 (x-16) – M=0 M = 0.43(x) – 0.95(x – 6) + 1.07(x – 16)
x 0 6M 0 2.58
x 6 16M 2.58 -2.62
x 16 21M -2.62 0