A person holds a 50.0-N sphere in his hand.The forearm is horizontal,as shown in Figure 12.8a.The biceps muscle is attached 3.00 cm from the joint,and the sphere is 35.0 cm from the joint.Find the upward force exerted by the biceps on the forearm and the downward force exerted by the upper arm on the forearm and acting at the joint.Neglect the weight of the forearm Biceps mg=50.0N d=3.00cm C=35.0cmA person holds a 50.0-N sphere in his hand. The forearm is horizontal, as shown in Figure 12.8a. The biceps muscle is attached 3.00 cm from the joint, and the sphere is 35.0 cm from the joint. Find the upward force exerted by the biceps on the forearm and the downward force exerted by the upper arm on the forearm and acting at the joint. Neglect the weight of the forearm