Motion in Gravitational Fields

These questions cover the gravity skills that school trial papers test again and again: Newton's law, field strength, orbital speed and period, Kepler's third law, satellites, potential energy, total energy and escape velocity. Use $G=6.67\times 10^{-11}$ N m² kg⁻², Earth's mass $6.0\times 10^{24}$ kg and Earth's radius $6.371\times 10^6$ m. They start easy and get harder. Stuck? Tap Show a hint for one step at a time.