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July 29, 2014

Homework Help: science

Posted by tasha on Monday, February 19, 2007 at 2:10am.

A crane whose motor has a power input of 5.0 kW lifts a 120-kg load of bricks through a height of 30m in 90s. what is the efficiency of the crane, which is the ratio between its output power and its input power.

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