176_Physics ProblemsTechnical Physics

# 176_Physics ProblemsTechnical Physics - 178 Circular Motion...

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178 Circular Motion and Other Applications of Newton’s Laws Additional Problems *P6.50 When the cloth is at a lower angle θ , the radial component of F ma = reads n mg mv r + = sin θ 2 . At θ = ° 68 0 . , the normal force drops to zero and g v r sin68 2 °= . R 68° p mg p mg cos68° mg sin68° FIG. P6.50 v rg = ° = ° = sin . . sin . 68 0 33 9 8 68 1 73 m m s m s 2 a f e j The rate of revolution is angular speed = F H G I K J F H G I K J = = 1 73 1 2 2 2 0 33 0 835 50 1 . . . . m s rev m rev s rev min b g a f π π π r r . *P6.51 (a) v = F H G I K J F H G I K J = 30 1 1 000 8 33 km h h 3 600 s m 1 km m s b g . F ma y y = : + = −
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