Posted by Physics on Sunday, September 13, 2009 at 9:42am.
I have no idea how to do this problem
At what distance from the Earth will a spacecraft on the way to the Moon esperience zero net force due to these two bodies because the EArth and Mon pull with equal and opposite forces?
there\'s no data in the question to use

Physics  bobpursley, Sunday, September 13, 2009 at 9:44am
The data you need is the Mass of the Earth, Mass of the Moon, the radius of Moons orbit, and the universal gravitation constant. From the centers of Earth and Moon, you know that distance, then let some x be from center of earth. Find Force gravity of Earth at x, then find force gravity of moon at rx. Set the forces equal and solve for x.