D1 solutions: Gravitational potential
1. The moon is about 1/4 the diameter of the Earth and 1/81 of its mass. The distance between the moon and Earth is approximately 60 x radius of the earth. Sketch a graph of the variation of gravitational potential between the Earth and the moon. A rocket is fired from the Earth towards the Moon. Just after it leaves the atmosphere the rocket motors are turned off leaving it to fly to the Moon without propulsion....