If you stand on one foot while holding your other leg up behind you, your muscles apply a force to hold your leg in this raised position. We can model this situation as in (Figure 1). The leg pivots at the knee joint, and the force that holds the leg up is provided by a tendon attached to the lower leg as shown. Assume that the lower leg and the foot have a combined mass of 4.0kg, and that their combined center of gravity is at the center of the lower leg.

Review | Constants How much force must the tendon exert to keep the leg in this position? If you stand on one foot while holding your other leg up behind you, Express your answer with the appropriate units. your muscles apply a force to hold your leg in this raised position. We can model this situation as in (Figure 1). The leg pivots at the knee joint, and the force that holds the leg up is provided by a tendon HA On ? attached to the lower leg as shown. Assume that the lower leg and the foot have a combined mass of 4.0kg, and that their combined center of gravity is at the center of the lower leg. Frendun = Value N Submit Previous Answers Request Answer X Incorrect; Try Again; 4 attempts remaining Part B As you hold your leg in this position, the upper leg exerts a force on the lower leg at the knee joint. What is the magnitude of this force? Express your answer with the appropriate units. HA ? Flance Value N Submit Previous Answers Request Answer Figure * Incorrect; Try Again; 4 attempts remaining The tendon provides Part C the torque to raise ......... the lower leg. What is the direction of the force exerted by the upper leg on the lower leg at the knee joint? horizontally rightward 5.0 cm- O vertically downward O vertically upward 50 cm O horizontally leftward