1) An experimental satellite is found to have a weight W when assembled before launching from a rocket site. It is placed in a circular orbit at a height h = 6R above the surface of the Earth (of radius R). What is the gravitational force acting on the satellite whilst in orbit?

2) Two stationary particles of masses M₁ and M₂ are a distance d apart. A third particle, lying on the line joining the particles, experiences no resultant gravitation force. What is the distance of this particle from M₁?

3) Two stars of equal mass M move with constant speed v in a circular orbit of radius R about their common centre of mass as shown in the figure below.

What is the net force on each star?

4) A 20 kg satellite requires a speed of 2.0 km s^–1 to stay in a circular orbit at a certain height above the Earth.

What would be the speed, in km s^-1, of a 100 kg satellite in the same orbit?

5) Which statement about a geostationary satellite is true?