Physics

Choose the correct statement.

In a thermodynamic process, pressure of fixed mass of a gas is changed in such a manner that the gas releases 20 J of heat and 8 J of work is done on the gas. If initial internal energy of the gas was 40 J, what will be final internal energy?

Two rain drops reach earth from clouds with different terminal velocities having ratio 9 : 4. Then the ratio of their volumes is

If work done in increasing the size of rectangular soap film with dimensions 8 cm * 3.75 cm to 10 cm * 6 cm is 2 * 10^–4 J. The surface tension of film in newton per meter is

A flywheel of mass 50 kg and radius of gyration about its axis of rotation of 0.5 m is acted upon by a constant torque of 12.5 N m. Its angular velocity at t = 5 s is

A wire can be broken by a load of 20 kg-wt. The force required to break wire of same material with twice the diameter will be

The height at which the weight of an object becomes (1/16)^th of its weight on the surface of earth is (R is radius of earth)

A body is released from height equal to radius R of the earth. The velocity of body with which it will strike the earth surface is

Two bodies of mass 10 kg and 2 kg are moving with velocities m/s and  m/s respectively. The velocity of their centre of mass is

In stable equilibrium position, a body has