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April 20, 2014

Homework Help: physics

Posted by Adam on Wednesday, October 15, 2008 at 5:25pm.

An athlete at the gym holds a 4.33 kg steel ball in his hand. His arm is 68.7 cm long and has a mass of 4.69 kg. What is the magnitude of the torque about his shoulder if he holds his arm straight out to his side, parallel to the floor?

I got an answer of 45 N*m (which is correct) but I am having trouble with the second question:

What is the magnitude of the torque about his shoulder if he holds his arm straight, but 46.6 below horizontal?

I tried the following but I'm stil confused as to what the answer is.

Knowing the angle, I drew a right triangle and used trig to get the distances, and then I did just what I did for the first part

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