204_Physics ProblemsTechnical Physics

204_Physics ProblemsTechnical Physics - 206*P7.50 Energy...

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206 Energy and Energy Transfer *P7.50 (a) We write Fa x a a b bb aa b b b b b = = = = F H G I K J = = == = × = 1 000 0 129 5 000 0 315 5 0315 0129 244 52 4 4 5 180 1000 401 10 1.80 4 N m m N 0.129 m Nm 1.8 . . . . . ln ln . ln ln . . . af a f a f (b) WF d x x d x x × = zz 0 025 41 . 8 0 4 28 0 4 294 .. . . . . . . . . . m 1.8 m 1.8 m 1.8 N m N m N m m J a f *P7.51 The work done by the applied force is W F dx k x k x dx k x dx k x dx k x k x k x k x i fx xx + =+ = + applied 1 2 2 0 1 0 2 2 0 1 2 0 2 3 0 1 2 2 3 23 ej max max max max max max max P7.52 (a) The work done by the traveler is mgh N s where N is the number of steps he climbs during the ride. N = (time on escalator)(
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