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July 25, 2014

Homework Help: Physics

Posted by Aly on Thursday, December 31, 2009 at 11:28am.

A man drinks a bottle of beer and proposes to work off it's 460 kj by exercising with a 20-kg barbell. If each lift of the barbell from chest height to over his head is through 60 cm and the efficiceny of his body is 10 percent under these circumstances, how many times must he left the barbell?

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