The distance of the centres of moon the earth is D. The mass of earth is 81 times the mass of the moon. At what distance from the centre of the earth, the gravitational force on a particle will be zero.

The distance between the centres of the Moon and the earth is D . The mass of the earth is 81 times the mass of the Moon. At what distance from the centre of the earth, the gravitational force will be zero?

A rocket is fired from the earth to the moon. The distance between the earth and the moon is r and the mass of the earth is 81 times the mass of the moon. The gravitational force on the rocket will be zero when its distance from the moon is

If the distance of the moon from earth is and the period of revolution is T_(m) ,then the mass of the earth is

If the distance between the earth and moon were doubled, the gravitational force between them will be

A satellite of mass m is revolving around the earth at a distancer r from the centre of the earth. What is its total energ?

The point at which the gravitational force acting on any mass is zero due to the earth and the moon system is (The mass of the earth is approximately 81 times the mass of the moon and the distance between the earth and the moon is 3,85,000km ).

Centre of mass of the earth-moon system lies

The gravitational potential energy of a body at a distance r from the centre of earth is U . Its weight at a distance 2r from the centre of earth is