First slide

Moment of intertia

Question

The moment of inertia of a ring of mass m and radius r about an axis, passing through the centre and perpendicular to the plane of the ring, is:

Easy

A

(1/2)mr²
B

mr²
C

(1/4)mr²
D

(3/4)mr²

Solution

for a ring about an axis perpendicular to its plane and passing through its center is mr² because all the masses are at a distance r from the axis.

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