A spaceship is travelling from earth to the moon. At this particular time of the month the distance between the centres of earth and moon is 400000km. There is a particular point where the ship will effectively become weightless, when the gravitational force exerted by the earth is equal to that exerted by the moon

A) show that at this point in the journey the following relationship holds:
mass of earth / radius² = Mass of moon on radius of moon
where radius is distance to each centre.

Question

A spaceship is travelling from earth to the moon. At this particular time of the month the distance between the centres of earth and moon is 400000km. There is a particular point where the ship will effectively become weightless, when the gravitational force exerted by the earth is equal to that exerted by the moon

A) show that at this point in the journey the following relationship holds:
mass of earth / radius² = Mass of moon on radius of moon
where radius is distance to each centre.

anonymous · Answer

or look at question 5 on this http://www.geoph.uq.edu.au/erth3020/gravity/erth3020_tut_gravity.pdf

anonymous · Answer

i dont really have an idea of now to work this out

anonymous · Answer

oops, the radius of the moon bit is also meant to be squared.

anonymous · Answer

space cows...the answer is always ALWAYS space cows...your welcome

anonymous · Answer

:(