A hollow spere of mass M and radius R is rotating with angular frequency `omega` it suddenly stops rotating and 75% of kinetic energy is converted to heat if s is the speicific heat of the material in j / kg k then rise in temperature of the spere is (MI of hollow sphere `=2/3MR^(2)`

Options

A. `(3R^(2)omega^(2))/(20s)`
B. `(R^(2) omega^(2))/(16.8 s)`
C. `(R^(2)omega^(2))/(4s)`
D. `(2R^(2)omega^(2))/(3s)`

Answer

3