A bowler holds a bowling ball with mass M = 7.2 kg in the palm of his hand. Lower arm has mass m = 2.1 kg. As the gure shows, his upper arm is vertical and his lower arm 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? \"ice!\" 4/ | Elbow 3 I contact / point l-B ,0 cm Lower arm 18 cm _. (forearm plus 40 cm band) center of mass (a) Number I Units (b) Number