Moment of Inertia of a Quarter Disc

[utsav55]

1. Find the Moment of Inertia of a Quarter Disc which has mass M and radius R about the axis passing through the center (of original disc) and perpendicular to the plane.

2. The attempt at a solution
I found the Moment of Inertia (I) of a disc about the axis passing through the center, perpendicular to the plane and divided by 4. It gave the wrong answer.

So, please tell me that why dividing by 4 is giving me the wrong answer for the quarter disc.

Also, a hint of how should I start the problem.

 

[Doc Al]

Dividing by 4 is correct. Did you use the correct mass? (I suspect that's the problem.)

 

[utsav55]

Dividing by 4 is correct. Did you use the correct mass? (I suspect that's the problem.)

Yes, I got it correct now.


Thanks