Questions
A Merry-go-round, made of a ring-like platform of radius R and mass M, is revolving with angular speed ω . A person of mass M is standing on it. At one instant, the person jumps off the round, radially away from the centre of the round (as seen from the round). The speed of the round afterwards is
detailed solution
Correct option is B
Li = (MR2 + MR2)ω = 2MR2ωLf = MR2 x ω + M x ω'R x R = 2MR2ω'Conserving angular momentum,2MR2ω' = 2MR2ω ⇒ ω' = ω [Here tangential velocity ω'R of the person produces angular momentum of the person]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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