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 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 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
Answer» `2/5 (PI^(2)n^(2)r^(2))/S` `1/10 (pi^(2)n^(2))/(r^(2)S)` `7/8 PIR^(2)n^(2)S` `(5(pin))/(14S)` ANSWER :A