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A 50

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A 50.0-N (11-lb) bowling ball is held in a person’s hand with the forearm horizontal, as in Figure 8.11a. The biceps muscle is attached 0.030 0 m from the joint, and the ball is 0.350 m from the joint. Find the upward force  width= exerted by the biceps on the forearm (the ulna) and the downward force  width= exerted by the humerus on the forearm, acting at the joint. Neglect the weight of the forearm and slight deviation from the vertical of the biceps.

FIGURE 8.11 (a) A weight held with the forearm horizontal. (b) The mechanical model for the system.


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