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 sixthstory window 16.0 m above?

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

physics  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)

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