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Work/energy?

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How long will it take a 1750 W motor to lift a 285 kg piano to a sixth-story window 16.0 m above?

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  1. t = F*h/W = mgh/W = 285*9.8*16/1750 = 25.536 sec


  2. It depends on the torque the motor  can generate too.  If it doesn't have the lifting power it'll never get it started.
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