Question 2 - A figure skater rotating at 5.00 rad/s with arms extended. If he pulls in his arms, the speed of rotation increases to 6.25 rad/s. (a) By what factor has his moment of inertia changed? (b) By what factor has his rotational kinetic energy changed? Question 3 - 7 '3 cm Approximately what magnitude force, FM, must the extensor muscle in the . .- 3()_{) Lm . .1 upper arm exert on the lower arm to hold a 7.3 kg shot put? Assume the lower arm has a mass of 2.3 kg and its CG is 12 cm from the elbow-joint pivot. \\ lilhuw jninl FM