The large quadriceps muscle in the upper leg terminates at its lower end in a te

Question

The large quadriceps muscle in the upper leg terminates at its lower end in a tendon attached to the upper end of the tibia (Fig. P8.27a). The forces on the lower leg when the leg is extended are modeled as in Figure P8.27b, where is the force of tension in the tendon, is the force of gravity acting on the lower leg, and is the force of gravity acting on the foot. Find when the tendon is at an angle of 25.0° with the tibia, assuming that ? = 22.0 N, F = 12.0 N, and the leg is extended at an angle ? of 40.0° with the vertical. Assume that the center of gravity of the lower leg is at its center, and that the tendon attaches to the lower leg at a point one fifth of the way down the leg. (in Newtons)
figure 8.27 --> http://www.webassign.net/sercp/p8-27.gif

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