286_Dynamics 11ed Manual

286_Dynamics 11ed Manual - Engineering Mechanics - Dynamics...

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Engineering Mechanics - Dynamics Chapter 14 Problem 14-71 If the spring is compressed a distance δ against the block of weight W and it is released from rest, determine the normal force of the smooth surface on the block when it reaches the point x 1 . Given: W 0.5 lb = b 1f t = k 5 lb in = 3in = x 1 0.5 ft = Solution: yx () x 2 2 b = y' x x b = y'' x 1 b = ρ x 1 y' x 2 + 3 y'' x = θ x ( ) atan y' x = T 1 0 = V 1 1 2 k 2 = T 1 1 2 W g v 1 2 = 0 1 2 k 2 + 1 2 W g v 1 2 Wy x 1 + = v 1 k 2 2 W = V 2 1 = F N W cos x 1 W g v 1 2 x 1 = F N W cos x 1 W g v 1 2 x 1 + = F N 3.041 lb = * Problem 14-72 The girl has mass
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This note was uploaded on 08/16/2011 for the course EGN 3321 taught by Professor Christianfeldt during the Spring '08 term at University of Central Florida.

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