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Question: problem 1458 the 51lb block rests on the rough surface...

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Problem 14.58

The 51-lb block rests on the rough surface for which the coefficient of kinetic friction is μk = 0.2. A forceF=(40+s2)lb, where s is in ft, acts on the block in the direction shown. The spring is originally unstretched (s = 0) and the block is at rest.

300 k 20 lb/ft

Part A


Determine the power developed by the force the instant the block has moved s = 1.5 ft.


Express your answer using three significant figures.


W = -------hp


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