Homework Help: Physics

Posted by McCaleb on Wednesday, March 23, 2011 at 10:04pm.

A pulley system has an efficiency of 78.0 per-
cent.
The acceleration of gravity is 9.81 m/s2 .
How much of the rope must be pulled in if
a force of 469 N is needed to lift a 52 kg desk
2.78 m?

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