Questions
A man spinning in free space changes the shape of his body by spreading his arms or curling up. By doing this he can change his
detailed solution
Correct option is D
Weight of the man does not produce any moment about its centre of mass. So net external torque acting on the man is zero and hence its angular momentum L remains conserved. In the process of spreading of arms or curling up, The man can change his moment of inertia I. Since L = Iω angular velocity ω changes. Since rotational kinetic energy K=L22I, rotational kinetic energy also changes.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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