Question

72
The moment of inertia of the given half disc of
mass m and radius r about an axis passing
through centre O and in its plane is
Options
1)mr2/4
2)mr2
3)mr2/2
4)mr2/8​

Answer 1

Answer:

3) (mr^2)/2

MoI of a known geometry when divided about its symmetrical axis is same as that of the original MoI

For eg:

MoI of a disc and semicircular disc is (mr^2)/2 where m is the mass of CORRESPONDING geometry.

Hope this answer helped you