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July 6, 2015

Homework Help: physics

Posted by genesis on Tuesday, May 1, 2012 at 9:54am.

A pulley system reduces the effort of lifting a big bucket of water from a shallow well. The 100-newton bucket is lifted to a height of 5 meters with an unknown input force. If 50 meters of rope is pulled to lift the bucket the desired height and the percent efficiency of the pulley system is 78%, what must the input force be?

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