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October 20, 2014

Homework Help: Science

Posted by Michele on Friday, August 31, 2007 at 8:03pm.

A man drinks a bottle of beer and proposes to work off its 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 efficiency of his body is 10 percent under these circumstances, how many times must he lift the barbell?

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