(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

In a system where other gravitational influences can be discounted, two particles of equall mass m, are fixed at positions x= 0 and x= x0 on the x-axis.

1) derive an expression for the gravitational potential Vgrav at a general position x on the x-axis.?

2. Relevant equations

The only equations i can seem to find are:

A) for a test mass m at a distance r from another mass M

Vgrav(r) = (1/m)Egrav = (1/m)(-GmM/r) = -GM/r

B) V(r) = Q/ 4pie e0 r

Where e0 is the permittivity of free space

3. The attempt at a solution

Well to derive an expression usually means i have to combine and rearrange two seperate expressions, but i do not know where to begin, maybe i dont need either of these expressions? could somebody please help me to understand what is goin on here? and prehaps where to start looking?

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Expression for the gravitational potential Vgrav

**Physics Forums | Science Articles, Homework Help, Discussion**