A space shuttle moves so that it is twice as far from the centre of Earth. How does the force of gravity acting on it change?*

a) It remains the same. b)It becomes two times larger. c) It becomes two times smaller.

d)It becomes four times larger. e)It becomes four times smaller.

Which of the following is not a factor that affects the speed of a satellite?*

a) height above the surface of the planet b)mass of the planet c)mass of the satellite

d) the universal gravitational constant e)none of the above

A planet has twice Earth's radius and twice Earth's mass. What is the gravitational field strength on this planet?*

a) 2.45 N/kg b)4.9 N/kg c)9.8 N/kg d)19.6 N/kg e)39.2 N/kg f)588 N/kg