Problem 9.68 I Review | Constants V Part A If a person of mass M simply moved forward with speed V: his kinetic energy WOU'd be MVz- What is the average angular velocity of his arms and legs? However, in addition to possessing a forward motion, various parts of his body (such as the arms and legs) undergo rotation. Therefore, his total kinetic energy is the sum of the energy from his forward motion plus the rotational kinetic energy of his arms and legs. The purpose of this problem is to see how much this rotational motion contributes to the person's kinetic energy. Biomedical w = rad /s measurements show that the arms and hands together typically make up 14% of a person's mass, while the legs and feet together account for 37%. For a rough (but reasonable) calculation, we can model the arms and legs as thin uniform bars pivoting about the shoulder and hip, respectively. In m Previous Answers Ewes! Answer a brisk walk, the arms and legs each move through an angle of about ::30 (a total of 60) from the vertical in approximately 1 second. We shall assume that they are held straight, rather than being bent, which is not quite true. Let us consider Part B Complete previous part(s) a 71 kg person walking at 5.5 km/h having arms 70 cm long and legs 91 cm long. Express your answer in radians per second to two significant figures. You have already submitted this answer. Enter a new answer. No credit lost. Try again. Part C Complete previous part(s) Part D Complete previous part(s) Provide Feedback \