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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 rotation/s. 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) )/( S)`

B

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

C

`( 7)/( 8) pi r^(2) n^(2) S`

D

`( 5 (pi r n))/( 14S)`

Text Solution

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The correct Answer is:
A
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