Questions
A metallic solid sphere of radius R and mass m is rotating about a smooth spindle through its centre. Now the sphere is heated. then its kinetic energy of rotation
detailed solution
Correct option is C
Due to thermal expansion, radius of the sphere increases. As a result its moment of inertia increases. Since no external torque is acting on the sphere, its angular momentum L remains unchanged.Now, K.E. of rotation =L22I . As I increases, K.E. decreases.Talk 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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