Question

Two spherical objects have masses of 8.1 x 10^2kg and 4x.5 10^8kg. The gravitational attraction between them is 1.9 x 10^-3 N.

Answer 1

Let's see

We need distance between them?

`\\ \rm\Rrightarrow F=(GMm)/(r^2)`

`\\ \rm\Rrightarrow r^2=(GMm)/(F)`

`\\ \rm\Rrightarrow r^2=(6.673* 10^(-11)* 8.1* 10^2* 4.5* 10^8kg)/(1.9* 10^(-3))`

`\\ \rm\Rrightarrow r^2=128.02* 10^(2)`

`\\ \rm\Rrightarrow r^2=12802`

`\\ \rm\Rrightarrow r=√(12802)`

`\\ \rm\Rrightarrow r=113.14m`