Question

What is the force on an object of 50 kg that is 80 m away from another object that is 150 kg?

 

An object is 300m from another object of mass 40kg and experiences a force of 50N. What is the mass of the first object?

 

Answer 1

Answer

Gravitational force between two masses is given

$F=\frac{Gmm'}{r^2}$

According to question

First case

$F_1=\frac{6.67×10^{−11}\times50\times150}{(80)^2}\\=7.80\times10^{−11} N$

Now mass of another object

$m=\frac{Fr^2}{Gm'}\\=\frac{50\times300^2}{6.67\times10^{-11}\times40}\\=16867\times10^{11}Kg$