Multiple Choice Problem $9\mathrm{.}08$

$2$ of $17$

Review

Constants

Two small objects of equal weight are attached to the ends of a thin weightless bar that spins about an axis perpendicular to the bar at its center. Each mass is a distance $d$ from the axis of rotation. The system spins at a rate so that its kinetic energy is $K.$

Part A

If both masses are now moved closer in so that each is $\frac{d}{5}$ from the rotation axis, while the angular velocity does not change, the kinetic energy of the system will be

$1/25$K$.$

$1/5$K$.$

$5K.$

$25$K$.$