Suppose you stand on one foot while holding your other leg up behind you. Your m

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Suppose you stand on one foot while holding your other leg up behind you. Your muscles will have to apply a force to hold your leg in this raised position. We can model this situation as in the figure. The leg pivots at the knee joint, and the force to hold the leg up is provided by a tendon attached to the lower leg as shown.Assume that the lower leg and the foot together have a combined mass of 4.5kg , and that their combined center of gravity is at the center of the lower leg. What is the magnitude of the force of the upper leg on the lower leg at the knee joint?

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