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A pulley system has an efficiency of 87.5 percent. How much of the rope must be pulled in if a force of 648 N is needed to lift a 150 kg desk 2.46 m?...

A pulley system has an efficiency of 87.5 percent.
How much of the rope must be pulled in if a force
of 648 N is needed to lift a 150 kg desk 2.46 m?
(Disregard friction.)

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