A 160-lb person is holding a 10-lb weight in his palm with the elbow fixed at 908 flexion (Fig. 4.8, top).
(a) What force must the biceps generate to hold the forearm in static equilibrium?
(b) What force(s) does the forearm exert on the humerus?
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Figure 4.8 (top) The forearm held statically fixed in 908 flexion while holding a 10-lb weight at the hand. (bottom) Free-body diagram of the forearm system
