The drawing shows an outstretched arm (0.61 m in length) that is parallel to the

Question

The drawing shows an outstretched arm (0.61 m in length) that is parallel to the floor. The arm is pulling downward against the ring attached to the pulley system, in order to hold the 128-N weight stationary. To pull the arm downward, the latissimus dorsi muscle applies the force in the drawing, at a point that is 0.069 m from the shoulder joint and oriented at an angle of 29?. The arm has a weight of 43 N and a center of gravity (cg) that is located d = 0.31 m from the shoulder joint. Find the magnitude of M.

Explanation / Answer

M=((128N)(0.61)-(43 N)(0.31))/(0.069m)sin 29 degree =(78.08-13.33)/0.033=1962.1212 N

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