Questions
A circular disc of mass m is revolving with angular velocity along a line passing perpendicular to its centre. When a mass m is gently attached to the revolving disc, then what will be new angular velocity
detailed solution
Correct option is D
For circular disc,I=12MR2∴ L=Iω=12mR2ωWhen a mass m is attached to the disc, thenL′=12mR2+mR2ω′=32mR2ω′An angular momentum is conservedL=L′∴ 12mR2ω=32mR2ω' or ω,=ω3Talk to our academic expert!
Similar Questions
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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