A disc is given an initial angular velocity `omega_(0)` and placed on a rough horizontal surface as shown Fig. The quantities which will not depend on the coefficient of friction is/are

We have a disc of neglligible thickness and whose surface mass density varies as radial disance from centre as sigma=sigma_(0)(1+r/R) , where R is the radius of the disc. Specific heat of the material of the disc is C . Disc is given an angular velocity omega_(0) and placed on a horizontal rough surface such that the plane of the disc is parallel to the surface. Coefficient of friction between disc and suface is mu . The temperature of the disc is T_(0) . Answer the following question on the base of information provided in the above paragraph Magnitude of angular acceleration of disc is

A uniform circular ring of radius R is first rotated about its horizontal axis with an angular velocity omega_0 and then carefully placed on a rough horizontal surface as shown. The coefficient of friction between the surface and the rings mu . Time after which its angular speed is reduced to 0.5 omega_0 is

A uniform disc of radius R is spinned to the angular velocity omega and then carefully placed on a horizontal surface. How long will the disc be rotating on the surface if the friction coeffiecient is equal to k? The pressure exerted by the disc on the surface can be neglected as uniform.

A uniform disc of radius R is spinned to the angular velocity omega and then carefully placed on a horizontal surface. How long will the disc be rotating on the surface if the friction coeffiecient is equal to k ? The pressure exerted by the disc on the surface can be regarded as uniform.