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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

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

B

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

C

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

D

`(5(pirn)^(2))/(14S)`

Text Solution

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The correct Answer is:
A
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