New Zealand Scholarship Physics Practice Questions - New Zealand Scholarship Physics Assessment (NZQA Standard 93103) Exam

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A thin uniform ring (hoop) and a solid uniform disk both have the exact same total mass M and outer radius R. How do their moments of inertia about a central axis perpendicular to their plane compare?

The ring has twice the moment of inertia of the disk. The disk has twice the moment of inertia of the ring. Both objects have identical moments of inertia. The ring has four times the moment of inertia of the disk.

Correct Answer:

The ring has twice the moment of inertia of the disk.

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