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Exercise 11.22

You are doing exercises on a Nautilus machine in a gym to strengthen your deltoid (shoulder) muscles. Your arms are raised vertically and can pivot around the shoulderjoint, and you grasp the cable of the machine in your hand 64.0 cm from your shoulder joint. The deltoid muscle is attached to the humerus 15.0 cm from the shoulderjoint and makes a 12.0 degrees angle with that bone. (See the figure below.)

http://tinypic.com/view.php?pic=jfx1z7&s=5

A)
If you have set the tension in the cable of the machine to 36.0 N on each arm, what is the tension in each deltoid muscle if you simply hold your outstretched arms inplace?
T= ____________N





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Answer #1

4000

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605 N is the answer

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