# physics

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

• physics -

Divide change in potential energy by the power of the motor.

• physics -

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 -

3.945 secomds

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