5.0 kg 2. In the gure to the right, a 5.0kg mass is held in a person's hand. Assume the bicep muscle is attached to the radius (a bone in the forearm) 4.0 cm from the elbow joint, and the mass in the hand is located 35.0 cm from the elbow joint. Note: while the brachialis muscle is actually more important for the emion 0f the elbow than the bicep, we will assume the bicep muscle is entirely responsible for the force in this problem. (a) While the arm is held at a right angle (6 = 90), what torque does the weight of the held mass produce on the elbow joint? (b) Assume that the forearm and hand have a total mass of 3.0 kg and that they may be approximated as a solid rod with length 35.0 cm. What torque is produced on the elbow joint by the weight of the forearm and hand? Hint: treat gravity as acting at the center of mass. (c) What total force will the bicep muscle need to produce to hold the forearm and mass at a right angle? Assume the force of the bicep 2'5 directed straight upward. (d) If the bicep muscle produces a force of 625 N, what is the instantaneous angular acceleration of the forearm (assuming it is still holding the mass)