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A metal sphere of radius r and specific ...

A metal sphere of radius r and specific heat S is rotated about an axis passing through its centre, at a speed of n rotations per second. It is suddenly stopped and `50%` of its energy is used in increasing its temperature. Then, the rise in temperature of the sphere is

A

`(2)/(5)(pi^(2)n^(2)r^(2))/(c)`

B

`(1)/(10)(pi^(2)n^(2))/(r^(2)c)`

C

`(7)/(8)pir^(2)n^(2)c`

D

`(1)/(8)(pi^(2)n^(2)r^(2))/(c)`

Text Solution

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The correct Answer is:
A
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