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Answer on Mechanics | Relativity Question for Paul

Question #5630
two wheels of moment of inertia 4 kgm^2 rotates sid by side at the rate of 120 rpm and 240 rpm respct. if now both the wheels are coupled by means of weightless shaft so that the wheels now rotates with a constant angular speed. find the new speed.
Expert's answer
According to the law of conservation of angular momentum
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