The gravitational force of a star on orbiting planet 1 is F_1. Planet 2, which is twice as massive as planet 1 and orbits at twice the distance from the star, experiences gravitational force F_2. What is the ratio F_1/F_2?

The ratio is  

Explanation:

From the question we are told that

    The mass of planet 1 is

    The first gravitational force is

     The mass of planet two is

       The distance of planet 1 from the star is

     The distance of planet 2 from the star is

      The second planet  gravitational force is

      The mass of the sun is  

Generally the  gravitational force for first planet is mathematically represented as

The  gravitational force for second planet is mathematically represented as  

So    

none, its a machine

its c i just checked it