3http://targetiit.com/iit-jee-forum/posts/rotation-4-1319.html
this will help :)
A diwali cracker known as sudarshan chakra works on the principle of thrust. Consider such a toy the centre of which is hinged. The initial mass of the toy is M0 and radius is R. The toy is in the shape of a spiral the turns of which are very close (it can be assumend 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 of the toy when mass remains half.
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2 Answers
24do we need to do all that ??
isnt it simply conservation of angualr momentum?
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