[" 86.A disc is given an initial angular velocity coo and "],[" placed on rough horizontal surface as showrn.The "],[" guantitics 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 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 block of mass m is placed on a rough horizontal surface. If minimum force to pull the block is (mg)/(2) then coefficient of friction is :

A block is sliding on a rough horizontal surface. If the contact force on the block is sqrt2 times the frictional force, the coefficient of friction is