# A solid sphere of mass and radius is placed on a rough horizontal surface. It is struck by a horizontal cuestick at a height above the surface. The value of so that the sphere performs pure rolling motion immediately after it has been struck is a) b) c) d) ## Question ID - 100232 :-  A solid sphere of mass and radius is placed on a rough horizontal surface. It is struck by a horizontal cuestick at a height above the surface. The value of so that the sphere performs pure rolling motion immediately after it has been struck is a) b) c) d) 3537

 (c) Let be the velocity of the centre of mass of the sphere and be the angular velocity of the body about an axis passing through the centre of mass  From the above two equations, From the condition of pure rolling,  Next Question :

A sphere is placed rotating with its centre initially at rest in a corner as shown in figures (a) and (b). Coefficient of friction between all surfaces and the sphere is 1/3. Find the ratio of the friction forces by ground in situation (a) and (b) a) 1 b) c) d) None of these 