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 $\frac{d}{9}$ from the rotation axis, while the angular velocity does not change, the kinetic energy of the system will be

$1/81$K$.$

$1/9$K$.$

$9K.$

$81K.$

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