Posted by ayyya on .
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