First slide

Moment of inertia

Question

In rectangle ABCD, AB = 2l and BC = l. Axes xx and yy pass through the centre of the rectangle. The moment of inertia is least about

Moderate

A

DB
B

BC
C

xx
D

yy

Solution

The distribution of mass is nearest to axis xx, hence moment of inertia is least about the xx-axis.

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