336_Dynamics 11ed Manual

336_Dynamics 11ed Manual - Engineering Mechanics Dynamics...

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Engineering Mechanics - Dynamics Chapter 15 Given W c d sin θ () 1 2 W r g v r 2 1 2 W c g v r v cr cos () () 2 v cr sin () () 2 + + = 0 W r g v r W c g v r v cr cos () () + = v r v cr Find v r v cr , () = v cr 27.9 ft s = v r 8.93 ft s = Problem 15-51 The free-rolling ramp has a weight W r . If the crate, whose weight is W c , is released from rest at A, determine the distance the ramp moves when the crate slides a distance d down the ramp and reaches the bottom B . Given: W r 120 lb = a 3 = b 4 = W c 80 lb = d 15 ft = g 32.2 ft s 2 = Solution: atan a b = Momentum 0 W r g v r W c g v r v cr cos () () + = v r W c W c W r + cos ()
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