The diagram of the leg shows the femur (1) and tibia (2). The quadriceps muscle (3) applies a force to the lower leg via a tendon (4) that is embedded with the kneecap (5). If the force applied by the muscle to the tendon is FM = 400N, what is the magnitude of the force of Listen bn the kneecap when the leg is in equilibrium? A simplified model of the leg is shown above. The leg bones are represented by two beams attached by a pin. The tendon is modelled by a rope and the kneecap acts like a pulley. The tendon above the kneecap makes an angle 01 = 30- with respect to the vertical, and the portion of the tendon below the kneecap makes an angle of 02 = 38 - with respect to the vertical