If the angular velocity of a planet about its axis is halved, the distance of the geostationary satellite of this planet from the center of the planet becomes 2n times the initial distance. The value of 'n' is:

On Earth, g ≈ 9.8 m/s2. If an object is moved to a location where g = 0, its mass:

The force with which the Earth attracts an object is called:

Two stars of masses m and 2m at a distance d rotate about their common centre of mass in free space. Their period of revolution is: