A disc is rotating with angular speed 0 0. If a child sits on it, what is conserved?
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Verified by ExpertsThe correct answer is:
B
: When a child sits on a rotating disc, no external torque is introduced. Hence the angular momentum of the system is conserved. But the moment of inertia of the system will increase and as a result, the angular speed of the disc will decrease to maintain constant angular momentum.angular momentum 
moment of inertia 
angular velocity]
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