일반물리학 1 — Equilibrium and Elasticity: Problem 51

51 A bowler holds a bowling ball (\(M = 7.6 \text{ kg}\)) in the palm of his hand (Fig. 12-52). His upper arm is vertical; his lower arm (\(1.9 \text{ kg}\)) is horizontal. What is the magnitude of (a) the force of the biceps muscle on the lower arm and (b) the force between the bony structures at the elbow contact point?