A 75 kg adult male is being tested for knee extension strength. The length of his calf segment is .38m. The combined calf/foot segment is 57% of the calf length from the knee joint. The radius of gyration of the calf/foot segment about its mass center is 45% of the calf length. The moment arm of the knee extensor muscle is .04m. The knee extension exercise equiptment padding is .35m from the knee joint.
A) what is the moment of interia of the calf/foot segment about the foot mass center?
b) what is the moment arm of the calf/foot segment about the knee joint?
c) the knee joint angle is being held at a constant 60 degress below the horizontal (flexion). If the maximum force that can be applied to the equiptment padding is 300 N, how much quadriceps muscle force is being generated?