# 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.

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