The leg and cast in Figure P4.18 weigh 230 N, with the center of mass as indicated by the blue arrow in the diagram. The counterbalance w1 weighs 120…

The leg and cast in Figure P4.18 weigh 230 N, with the center of mass as indicated by the blue arrow in the diagram. The counterbalance w1 weighs 120 N. Determine the weight w2 and the angle α needed so that no force is exerted on the hip joint by the leg plus cast.