The Russell Traction System To immobilize a fractured femur (the thigh bone), doctors ofte...

The Russell Traction System To immobilize a fractured femur (the thigh bone), doctors often utilize the Russell traction system illustrated in Figure. Notice that one force is applied directly to the knee, , while two other forces, and , are applied to the foot. The latter two forces combine to give a force that is transmitted through the lower leg to the knee. The result is that the knee experiences the total force . The goal of this traction system is to have directly in line with the fractured femur, at an angle of 20.0° above the horizontal. Find (a) the angle θ required to produce this alignment of and (b) the magnitude of the force, that is applied to the femur in this case. (Assume the pulleys are ideal.)

FIGURE