Posted by john on Thursday, February 23, 2012 at 3:55pm.
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 78.0kg person having arms 69.0cm long and legs 94.0 cm long. The person is running at 12.0km/h, with his arms and legs each swinging through +-30 in 1/2s . Assume that the arms and legs are kept straight.
a)What is the average angular velocity of his arms and legs?
i got 2.09 its correct
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.
Krot=? J
i solved this first ML= .37*78= 28.86kg
MA= .13*78= 10.14 kg
what do i do next im confused
C)What is the total kinetic energy due to both his forward motion and his rotation?
Ktotatl=? J
Part D) What percentage of his kinetic energy is due to the rotation of his legs and arms?
i know i have to Krot/ktotal to solve my problem
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