Questions
A boy standing on a rotating table with heavy spheres in his hands, suddenly brings his hands close to his body. The angular velocity of the table
detailed solution
Correct option is D
L = I ω⇒ ω = L / ISince net external torque on the system is zero, its angular momentum (L) about the axis of rotation remains conserved. When the boy brings his hands close to the body, moment of inertia I of the system decreases. Since W α 1 / I, angular velocity increases.Talk to our academic expert!
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A disc rotates freely with rotational kinetic energy E about a normal axis through centre. A ring having the same radius but double the mass of disc is now, gently placed on the disc. The new rotational kinetic energy of the system would be
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