# Biomedical measurements show that the arms and hands togethertypically make up 13.0 % of a person’s

Biomedical measurements show that the arms and hands togethertypically make up 13.0 % of a person’s mass, while the legs andfeet together account for 37.0 % . For a rough (but reasonable)calculation, we can model the arms and legs as thin uniform barspivoting about the shoulder and hip, respectively. Let us considera 74.0 kg person having arms 70.0 cm long and legs 90.0 cm long.The person is running at 12.0 km/h , with his arms and legs eachswinging through ±30∘ in 12s. Assume that the arms and legs arekept straight. a) what is the average angular velocity of his armsand legs? b)Using the average angular velocity from part A,calculate the amount of rotational kinetic energy in this person’sarms and legs as he walks. c)What is the total kinetic energy dueto both his forward motion and his rotation? d) What percentage ofhis kinetic energy is due to the rotation of his legs and arms? . . .