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December 18, 2014

Homework Help: physics

Posted by Sara on Sunday, October 12, 2008 at 11:22am.

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?

Torque = massball x g + massarm x g/2

= 4.33 kg x 9.8 + 4.69 kg x 9.8/2

= 42.434 + 22.981

= 65.415 N

Why is my answer incorrect?

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