The moon revolves round the earth `13` times in one year. If the ratio of sun-earth distance to earth-moon distance is `392`, then the ratio of masses of sun and earth will be

The time take Mars to revolve round the sun is 1.88 years.Find the ratio of average distance between mars and the sun to that between the earth and the sun.

The acceleration due to gravity on the moon is only one sixth that of earth.It the earth and moon are assume to have the same density, the ratio of the radii of moon and earth will be

The moon revolves around the earth because the earth exerts a radial force on the moon. Does the earth perform work on the moon?

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 mass of the earth is 81 times the mass of the Moon and the distance between the earth and the Moon is 60 time the, radius of the earth. If R is the radius of the earth, then the distance between the Moon and the point on the in joining the Moon and the earth where the gravitational force becomes zero is

The earth revolves round the sun in one year. If the distance between them becomes double, the new period of revolution will be