Questions
Two wheels of M.I. 3kg m2 and 5kg m2 are rotating at the rate of 600 rpm and 800 rpm respectively in the same direction. If the two are coupled so as to rotate with the same axis of rotation, the resultant speed of rotation will be (in rpm)
detailed solution
Correct option is A
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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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