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January 26, 2015

January 26, 2015

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

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.

- physics/math -
**drwls**, Tuesday, August 12, 2008 at 11:16amHow about if you, yes you, do the calculations? It is you who is taking the course.

Where he places his hands doesn't matter. We will have to assume that his center of gravity is at floor level at the bottom of his pushups, although this cannot be strictly true.

Calculate how far he raises his body with each pushup, and multiply that by m g x 100.

- physics/math -
**ZneedHeLP**, Tuesday, August 12, 2008 at 10:09pmHere is the problem

A typical atom has a diameter of about 1.0 X 10^-10m. What it is in inches?

How many atoms are there along a 1.0 cm line?

( I got the first part but confuse w/ the second part. how do I know how many atoms are there? Please help me)

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