Q.12 A diwali cracker known as sudarashan chakra works on the principle of thrust. Consider such a toy the centre of which is hinged.The initial mass of the toy is M() and radius is R. The toy is in the shape of a spiral the turns of which are very close (it can be assumed as a disc ).The gases are ejected tangentially from the end of the toy with a constant velocity u relative to the toy. Find the angular velocity ofthe toy when mass remains half.

sangram patra , 13 Years ago

Grade 12