The minute and hour hands of a clock have a common axis of rotation and equal mass. The minute hand is long, thin, and uniform; the hour hand is short, thick, and uniform. Choose the best explanation from among the following: I. The hands have equal mass, and hence equal moments of inertia. II. Having mass farther from the axis of rotation results in a greater moment of inertia. III. The more compact hour hand concentrates its mass and has the greater moment of inertia.

Babe Ruth steps to the plate and casually points to left center field to indicate the location of his next home run. The mighty Babe holds his bat across his shoulder, with one hand holding the small end of the bat. The bat is horizontal, and the distance from the small end of the bat to the shoulder is $22.5 \mathrm{~cm}$. If the bat has a mass of $1.10 \mathrm{~kg}$ and has a center of mass that is $67.0 \mathrm{~cm}$ from the small end of the bat, find the magnitude and direction of the force exerted by the hand.

The moment of inertia of a 0.98-kg bicycle wheel rotating about its center is $0.13 \mathrm{kg} \cdot \mathrm{m}^{2}$. What is the radius of this wheel, assuming that the weight of the spokes can be ignored?