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 stopped and 50% of its energy is used in increasing its temperature, then the raise in temperature of the shere is

A metal sphere of radius r and specific heat S is rotated about an axi

1.	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 stopped and 50% of its energy is used in increasing its temperature, then the raise in temperature of the shere is
Answer» `2/(5)(pi^(2)N^(2)r^2)/S` `1/(10)(pi^2n^2)/(r^2S)` `(7)/(8)pir^(2)n^(2)S` `(5(pim))/(14S)` ANSWER :A