Homework Help: Physical science

Posted by Cindy on Monday, March 8, 2010 at 1:50pm.

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 lift the barbell?

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