Questions
A circular turn table rotates about its normal axis with uniform angular speed . A circular thick layer of ice and of radius much smaller than the table - top rotates along with the table. The new angular speed of the table when ice starts melting is
detailed solution
Correct option is B
From L.C.A.M; Iω = L = constant. As the ice melts, it takes the shape of a thin disc whose radius is gradually increasing. Since , angular velocity of the system gradually decreases. Hence option (2) is right.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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