Two uniform circular disks having the same mass and the same thickness are made from different materials.The disk with the smaller rotational inertia is:
A)the one made from the more dense material
B)the one made from the less dense material
C)neither - both rotational inertias are the same
D)the disk with the larger angular velocity
E)the disk with the larger torque

Question

Quizplus · Accepted Answer

The disk made from the more dense material has a smaller rotational inertia because its mass is distributed closer to the axis of rotation. In uniform circular disks of the same mass and thickness, density affects how mass is distributed across the disk. Higher density means mass is concentrated closer to the center, reducing the rotational inertia.

Two Uniform Circular Disks Having the Same Mass and the Same