First slide

Moment of intertia

Question

Find moment of inertia of a uniform annular disc of mass 100 g, having inner radius l0 cm and outer radius 20 cm, about an axis passing through its centre and perpendicular to its plane :

Easy

A

2.5x10^-3 kg.m²
B

1.5 x 10^-3 kg.m²
C

5 x 10^-3 kg. m²
D

6 x 10^-3 kg.m²

Solution

$I = M [\frac{R_{1}^{2} + R_{2}^{2}}{2}] = 0 .1 [\frac{(0 .1)^{2} + (0 .2)^{2}}{2}]$
2.5x10^-3 kg.m²

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