To increase the rotational inertia of a solid disk about its axis without changi

Question

To increase the rotational inertia of a solid disk about its axis without changing its mass: A: drill holes near the axis and put the material near the rim B: drill holes near the rim and put the material near the axis C: drill holes at points on a circle near the axis and put the material at points between the holes D: do none of the above (the rotational inertia cannot be changed without changing the mass E: drill holes at points on a circle near the rim and put the material at points between the holes

Explanation / Answer

In order to increase rotational inertia, we must make the disk lighter at the center ( rotational axis). To do so we can drill holes near the axis and tranfer the material to the rim of the disk. In this way, the mass will remian same and we will achieve an increased rotational inertia. In simple terms, we should move the material as far as possible from the axis.

Therefore, Option A is the correct answer.

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