Physics Test 12...

A uniform flexible chain of mass m and length 2 l hangs in equilibrium over a smooth horizontal pin of negligible diameter. One end of the chain is given a small vertical displacement so that the chain slips over the pin.The speed of chain when it leaves pin is

A stone is tied with a string and is rotated in a circle horizontally. When the string suddenly breaks, the stone will move

A particle of mass m begins to slide down a fixed smooth sphere from the top. What is its tangential acceleration when it breaks off the sphere ?

A uniform circular disc of radius a is taken. A circular portion of radius b has been removed from it as shown in figure. If the centre of hole is at a distance c from the centre of the disc, the distance x₂ of the centre of mass of the remaining part from the intial centre of mass O is given by

A boy of mass m is standing on a block of mass M kept on a rough surface. When the boy walks from left to right on the block, the centre of mass (boy block) of system

The radius of gyration of a uniform rod of length L about on axis passing through its centre of mass is

Three thin rods each of length L and mass M are placed along x,y and z axis such that one end of each rod is at origin. The moment of inertia of this system about z-axis is

A ring and a disc having the same mass, roll without slipping with the same linear velocity. If the kinetic energy of the ring is 8J, that of the disc must be

In case of an orbiting satellite if the radius of orbit is decreased

For a satellite orbiting very close to earth’s surface total energy is