1. A flywheel of mass 100 kg and radius of gyration 350 mm is rotating at 720 r.p.m. It is brought to rest by means of a brake. The mass of the brake drum assembly is 5 kg. The brake drum is made of cast iron FG 260 having specific heat 460 J/kg°C. Assuming that the total heat generated is absorbed by the brake drum only, calculate the temperature rise. [Ans. 15.14°C]