40. A 5 kg ball is held in the hand as shown in the figure, with the armhorizontal and 40 cm from the elbow joint. The forearm mass is 2 kgand the center of gravity is 18 cm from the joint. The biceps connectto the arm at 5 cm from the joint. How much force (FM) must the bicepsexert to hold the ball in place? (Gravitational acceleration g = 10 m/s2)