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Two discs one of density 7.2 g//cm^(3) a...

Two discs one of density `7.2 g//cm^(3)` and the other of density `8.9g//cm^(3)` are of same mass and thickness. Their moments of inertia are in the ratio

A

`8.9/7.2`

B

`7.2/8.9`

C

`(8.9xx7.2):1`

D

`1:(8.9xx7.2)`

Text Solution

Verified by Experts

The correct Answer is:
A
`I=(MR^(2))/2rArr(I_(1))/(I_(2))=(R_(1)^(2))/(R_(2)^(2))=(rho_(2))/(rho_(1))=8.9/7.2`
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