physics
posted by ayyya .
How long will it take a 1030 W motor to lift a 330 kg piano to a sixthstory window 13.0 m above?

physics 
drwls
Power(W) * Time(seconds) = Work (Joules)
The Work is M*g*H
H = 13.0 meters, the height it must be lifted
Now you can finish the calculation of Time required
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