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A flywheel rotating about a fixed axis h...

A flywheel rotating about a fixed axis has a K.E. of 360 J, when its angular speed is 30 rad `s^(-1)`. The M.I. of the flywheel about the axis of rotation is :

A

`0.15kgm^(2)`

B

`0.8kgm^(2)`

C

`0.6kgm^(2)`

D

`0.75kgm^(2)`

Text Solution

Verified by Experts

The correct Answer is:
B
`E_(rot)=(1)/(2)Iomega^(2)360(1)/(2)I(30)^(2)`
implies `I=(720)/(900)=0.8kgm^(2)`
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