Homework Help: physics

Posted by Amelia on Tuesday, April 10, 2012 at 1:26pm.

How long will it take a 1630 W motor to lift a 285 kg piano to a sixth-story window 16.0 m above?

physics - bobpursley, Tuesday, April 10, 2012 at 2:04pm
power=work/time

time=work/power=285g*16m/1630 assumeing 100 percent mechanical efficiency.

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