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July 28, 2014

Homework Help: Physics-repost, sorry, I still don't understand :(

Posted by Sukie on Sunday, March 1, 2009 at 6:52pm.

A forearm with a mass of 1.2kg supports a ball with a mass of 5.44 kg. The forearm is 0.050m long; it's perpendicular to the arm is 0.35m long, the center of gravity is at 0.15m from the elbow. Find the force exerted by rhe biceps and the force on the elbow joint.

I know this is just like any other problem with center of gravity and trying to find the forces on both ends supporting the ball, but there's only one support, the elbow, so that would be the fulcrum and even then, what does the forearm length have to do with it? I don't know how to set up the equation.

Sorry to post again, I think Damon tried to explain this to me in an earlier post, but after spending time trying to figure this out, i still don't get it.

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