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  exerted by the biceps on the forearm (the ulna) and the downward force  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.