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A ball kept in a closed box moves in the box making collisions with the walls. The box is kept on a smooth surface. The velocity of the centre of mass

Which of the following sentences is not correct? When a body rolls on a horizontal surface

Torque per unit moment of inertia is equivalent to

The moment of inertia of a ring about its geometrical axis is I, then its moment of inertia about its diameter will be

A ring is rolling on an inclined plane. The ratio of the linear and rotational kinetic energies will be

The angular momentum and the moment of the inertia are respectively

Two spherical bodies of masses M and 5 M and radii R and 2R respectively are released in free space with their initial separation between their centres equal to 12R. Then the distance covered by the smaller body just before collisions is

Two point masses A of 300 gram and B of 700 gram are fixed at the ends of a rod of length 140 cm and of negligible masses. The rod is set rotating about an axis perpendicular to its length with a uniform angular speed. For the work required for rotation of the rod to be minimum, the rod should have axis through a point located at a distance of

A force of 15 N is applied to a spanner at an effective length of 140 mm from the centre of a nut. The magnitude of the force required to produce the same moment if the effective length is reduced to 100 mm is

Two persons A and B , each of mass 60 kg, are standing together inside a trolley of mass 240 kg which is initially at rest on a frictionless surface. B now beings to walk along the length of the trolley and, after some time. A find B to be at a distance 10m. Distance travlled by B as observed by a person C standing on ground (outside the trolley) is approximately