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.

A ring of radius R is first rotated with an angular velocity omega and then carefully placed on a rough horizontal surface. The coefficient of friction between the surface and the ring is mu . Time after which its angular speed is reduced to half is

A ring of radius R is first rotated with an angular velocity omega and then carefully placed on a rough horizontal surface. The coefficient of friction between the surface and the ring is mu . Time after which its angular speed is reduced to half is

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

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

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_(0) lies on a smooth horizontal plane. A similar disc spinning with the angular velocity omega_(0) is carefully lowered onto the first disc. How soon do both discs spin with the same angular-velocity if the friction coefficient between them is equal to mu ?

A uniform disc of radius r_(0) lies on a smooth horizontal plane. A similar disc spinning with the angular velocity omega_(0) is carefully lowered onto the first disc. How soon do both discs spin with the same angular-velocity if the friction coefficient between them is equal to mu ?