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

Assuming that the gravitational potential energy of an object at infinity is zero, the change in potential energy (final - initial) of an object of mass m, when taken to a height h from the surface of earth (of radius R), is given by,

A body of mass 'm' is taken from the earth’s surface to the height equal to twice the radius (R) of the earth. The change in potential energy of body will be

The work done to raise a mass m from the surface of the earth to a height h, which is equal to the radius of the earth, is:

The acceleration due to gravity on the planet A is 9 times the acceleration due to gravity on planet B. A man jumps to a height of 2m on the surface of A. What is the height of jump by the same person on the planet B?

Assuming earth to be a sphere of uniform density, what is the value of 'g' in a mine 100 km below the earth's surface? (Given, R-6400 km)

Dependence of intensity of gravitational field (E) of earth with distance (r) from centre of earth is correctly represented by:

A body weighs 72 N on the surface of the earth. What is the gravitational force on it due to earth at a height equal to half the radius of the earth from the surface?

In a rocket a seconds pendulum is mounted. Its period of oscillation decreases when the rocket