Questions
A solid sphere is rotating freely about its symmetry axis in free space. The radius of the sphere is increased keeping its mass same. Which of the following physical quantities would remain constant for the sphere?
detailed solution
Correct option is D
As there is no external torque acting on a sphere, i.e.,τex=0 So, dLdt=τex=0 i.e., L= constant So angular momentum remains constant.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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