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A thin uniform ring of mass 5 kg and rad...

A thin uniform ring of mass 5 kg and radius 0.2 metre is making 2100 r.p.m. about its central axis. Its moment of inertia and kinetic energy of rotation is :

A

`0.2kgm^(2),4836J`

B

`0.4kgm^(2),3648J`

C

`0.02kgm^(2),3936J`

D

`0.04kgm^(2),8436J`

Text Solution

Verified by Experts

The correct Answer is:
A
Here M.I. = `MR^(2)`
K.E. = `(1)/(2)Iomega^(2)`
Substitute and calculate
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