A mass m is moving with a constant velocity parallel to the x-axis. Its angular momentum w.r.t. the

origin

A hollow sphere and a solid sphere having same mass and same radii are rolled down on a rough

inclined plane

A solid sphere, a hollow sphere and a disc, all having same mass and radius, are placed at the top of a smooth incline and released. Least time will be taken in reaching the bottom by

In rear-wheel drive cars, the engine rotates the rear wheels and the front wheels rotate only because the cars moves. If such a car accelerates on a horizontal road, the friction (Indicate the FALSE statement)

A fly wheel rotates about an axis. Due to friction at the axis, it experiences angular retardation proportional to its angular velocity. If its angular velocity falls to half the value while it makes n revolutions, how many more revolutions will it make before coming to rest ?