Biomedical measurements show that the arms and hands together typically make up 13.0 of a person's mass, while the legs and feet together account for 37.0 . For a rough (but reasonable) calculation, we can model the arms and legs as thin uniform bars pivoting about the shoulder and hip, respectively. Let us consider a 77.0 person having arms 66.0 long and legs 90.0 long. The person is running at 12.0 , with his arms and legs each swinging through in . Assume that the arms and legs are kept straight.
Part A What is the average angular velocity of his arms and legs?
Part B Using the average angular velocity from part A, calculate the amount of rotational kinetic energy in this person's arms and legs as he walks.
Part C What is the total kinetic energy due to both his forward motion and his rotation?
Part D What percentage of his kinetic energy is due to the rotation of his legs and arms?