If the radius of Earth is reduced by 50% keeping mass constant, the value of g on the surface will:

The escape velocity from Earth is 11.2 km/s. For a planet with mass 8 times and radius 2 times that of Earth, escape velocity is:

At what height above Earth's surface does g become half its surface value? (R = radius of Earth)

The gravitational potential energy of a body of mass m at height h from Earth's surface is: (h << R)

Kepler's third law states that:

Orbital velocity of a satellite near Earth's surface is approximately:

Geostationary satellite has orbital period of:

At the centre of Earth, the gravitational acceleration is:

The ratio of escape velocity to orbital velocity is:

Gravitational force between two bodies is: