Posted by **jerry** on Monday, October 12, 2009 at 7:34pm.

How long will it take a 1920 W motor to lift a 285 kg piano to a sixth-story window 16.0 m above?

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**MathMate**, Monday, October 12, 2009 at 8:38pm
Divide change in potential energy by the power of the motor.

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**jerry**, Wednesday, October 14, 2009 at 8:19pm
change in potential energy divided by the power. ( 1 W = 1 J/s)

Initial potential energy= mass* g* height

= mass * g*0

= 0

Final potential energy = mass* g* 16.0

finf diffence between final and initial and divide by Power. Answer will be in seconds(s)

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**Anonymous**, Sunday, March 2, 2014 at 1:06am
3.945 secomds

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