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A thin circular metal disc of radius 500...

A thin circular metal disc of radius 500.0 mm is set rotating about a central axis normal to its plane. Upon raising its temperature gradually, the radius increases to 507.5 mm. The percentage change in the rotational kinetic energy will be

A

`1.5%`

B

`-1.5%`

C

`3%`

D

`-3%`

Text Solution

Verified by Experts

The correct Answer is:
D
`(dR)/(R) xx 100 = 1.5, (dK)/(K) = (-2dR)/(R)`
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