A man is holding a 2.80-kg ball, as shown in the figure. The distance from the elbow joint to the ball is d ball = 32.5 cm, and the distance from the elbow joint to the insertion of the triceps muscle...

A man is holding a 2.80-kg ball, as shown in the figure. The distance from the elbow joint to the ball is d_ball= 32.5 cm, and the distance from the elbow joint to the insertion of the triceps muscle is d_M= 2.50cm. The mass of the lower arm, including the hand, is 3.60 kg, and its center of gravity is at a distance d_CG= 13.6cm from the elbow joint.

1. Draw a free body diagram of the forearm.

2. What is the magnitude of the force F_M, exerted by the triceps?

3. What is the force exerted by the humerus on the elbow joint?