A research satellite is in a stable circular orbit around Uranus. Its controllers reduce the satellite's speed and try to place it in a new stable circular orbit. Which statement is correct?
The new orbit must have a larger radius, because a slower satellite needs a larger orbital radius.
The new orbit must have a smaller radius, because gravity has more time to pull the slower satellite inwards.
No new orbit can be stable, because reducing the speed stops gravity providing the centripetal force.
The new orbit must have the same radius, because gravity still acts towards the centre of Uranus.
84 exam-style questions on AQA GCSE Physics 8.1 Solar system; stability of orbital motions; satellites, covering 8.1.1 Our solar system, 8.1.2 The life cycle of a star, and 8.1.3 Orbital motion, natural and artificial satellites. Each one has a worked solution and a mark scheme showing where the marks go.