Questions
A thin circular ring of mass M and radius r is rotating about an axis passing through its centre and perpendicular to its plane with a constant angular velocity . Two objects, each of mass m are attached gently to the opposite ends of a diameter of the ring'
The ring now rotates with angular velocity
detailed solution
Correct option is D
We know that the angular momentum is conserved,.i.e.,I1ω=I2ω′ or M.R2ω=(M+2m)R2ω′∴ ω′=Mω(M+2m)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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