If R is the radius of a planet and g is the acceleration due to gravity, then the mean density of the planet is given by

The escape velocity for a planet is upsilon_e . A tunnel is dug along a diameter of the planet and a small body is dropped into it at the surface. If R is the radius of the planet and g is the acceleration due to gravity at its surface then the body will reach the centre of the planet in time

How does acceleration due to gravity vary with mass and radius of the planet ?

A planet has twice the values of mass and radius of earth. Acceleration due to gravity on the surface of the planet is :

The density of a newly discovered planet is twice that of earth. The acceleration due to gravity at the surface of the planet is equal to that at the surface of the earth. If the radius of the earth is R , the radius of the planet would be

The density of a newly discovered planet is twice that of earth. The acceleration due to gravity at the surface of the planet is equal to that at the surface of the earth. If the radius of the earth is R , the radius of the planet would be