Question

Two objects have masses of `18 MG` and `2 MG`. How much does the gravitational potential energy between the objects change if the distance between them changes from `160 m` to `230 m`?

Answer 1

`4.841*10^-8N`

Explanation:

`F=(Gmm)/d^2`

Solve each case.
`F=(6.67*10^-11Nm^2/ (kg^2) *18,000kg *2000kg)/(160m)^2`
`F=9.38*10^-8 N`

Case2

`F=(6.67*10^-11Nm^2/ (kg^2) *18,000kg *2000kg)/(230m)^2`
`F=4.539*10^-8N`

The difference is `9.38*10^-8 - 4.539*10^-8=4.841*10^-8N`