The weight of a body on the earth is 400 N. Then weight of the body when taken to a depth half of the radius of the earth will be

A body weighs 200 N on the surface of the earth. How much will it weigh half way down to the centre of the earth?

Two particles of masses 4kg and 8kg are kept at x = - 2m and x = 4m respectively. Then, the gravitational field intensity at the origin is

Statement A : Shock absorbers reduce the magnitude of change in momentum.

Statement B : Shock absorbers increase the time of action of impulsive force

A force of 25 N acts on a body at rest for 0.2s and a force of 70 N acts for the next 0.1s in opposite direction. If the final velocity of the body is 5ms–1, the mass of the body is

A force of 5 N acts on a body for 2 milliseconds. Calculate the impulse. If the mass of the body is 5g, calculate the change of velocity.

Gravel is dropped on a conveyor belt at the rate of 2 kg/s. The extra force required to keep the belt moving at 3ms–1 is

The internal forces acting on an isolated system