# Solving for gravitational pull

1. Feb 19, 2013

### jaff

How far from Uranus must a space probe be along a line toward the Sun so that the Sun's gravitational pull on the probe balances Uranus's pull?

Fg=Gm1m2/r^2

Would m1 be the sun's mass and m2, Uranus' mass. then what would Fg be?

2. Feb 19, 2013

### SammyS

Staff Emeritus
Hello jaff. Welcome to PF !

If m1 is the sun's mass and m2, Uranus' mass,

and also of r is the distance Uranus is from the sun, then Fg=Gm1m2/r^2 is the force the sun exerts on Uranus.

3. Feb 19, 2013

### jaff

thank you,

but its asking for the distance (km)

4. Feb 19, 2013

### SammyS

Staff Emeritus
Then one piece of information you will need is the distance that Uranus is from the sun.

Other information you will need are the masses of the sun and Uranus, or at least the ratio of their masses.

You will need to express the force that Uranus exerts on the probe.

You will need to express the force that the sun exerts on the probe.

You will need to equate those two forces.