A satellite must remain above the same point on the Earth's equator. The Earth rotates once every 24 h.
Which combination is required for the satellite's orbit?
Period of 24 h; opposite direction to the Earth rotating.
Period of 12 h; same direction as the Earth rotates.
Period of 12 h; opposite direction to the Earth rotating.
Period of 24 h; same direction as the Earth rotates.
80 exam-style questions on Edexcel GCSE Physics 7.1 The Solar System and gravity, covering 7.1.1 Weight and g on different bodies in space, 7.1.2 The Solar System, 7.1.3 Changing ideas about the Solar System, 7.1.4 Orbits of moons, planets, comets and satellites, and 7.1.5 Gravity and orbital motion. Each one has a worked solution and a mark scheme showing where the marks go.