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April 21, 2014

Homework Help: physcis

Posted by Ania on Tuesday, November 15, 2011 at 7:59pm.

A crane whose motoer has a power input of 5.0kW lifts a 1200-kg load of bricks through a height 30m in 90s. Find the efficency of the crane which is the ratio between its output power and its input power

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