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April 18, 2014

Homework Help: physics/math

Posted by kristin on Tuesday, August 12, 2008 at 11:05am.

Joe is a former basketball player who is now a work-out junkie, and especially loves to do push-ups. He was a good athlete, but not so good at science in school, especally not good in Physics. He wants you, yes you, to calculate how much work he does, in strict terms of Physics, when he does his push-ups.
Joe is exactly 2 metes tall. His center of gravity is in the middle, one meter from either end. When he places his hands to do push-ups, they are 1.5 meters from his toes. He has long arms, so when he raises himself up all the way off the floor, his center of gravity is exactly one meter off the floor (OK, that makes him built like an orangutan, give me a break, I'm trying to keep the numbers simple). How much work would he do, in Joules, of course, if he does 100 push-ups? Remember, the acceleration of gravity is 9.8 meters per second squared.

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