A pulley system is used to lift a piano 2.6 m. If a force of 2510 is applied to the rope as the rope is pulled in 14 m, what is the efficiency of the machine? Assume the mass of the piano is 750 kg.

Question

I know the equation is eff = Wout / Win
I'm just confused on what I'm supposed to plug-in.

Anonymous · Answer

I figured it out! PEg = g x m x h W = F x h PEg/W

Becky · Answer

I figured it out! PEg = gmh W = Fh PEg/W