Aplanet has a mass of about 6.4 x 1023 kg, and its moon has a mass of about 9.6 x 1015 kg. if the magnitude of the gravitational force between the two bodies is 4.6 x 1015 n, how far apart are the planet and its moon?
a. 9.4 x 106
c. 4.6 x 109
b. 2.6 x 1015
d. 1.2 x 102

This can be solve using the law of gravitation:

F = G(m1*m2)/r^2

where:

·         F is the force between the masses;

·         G is the gravitational constant (6.674×10−11 N · (m/kg)2);

·         m1 is the first mass;

·         m2 is the second mass;

·         r is the distance between the centers of the masses.

4.6x10^15 N = ( 6.674×10−11 N · (m/kg)2)(6.4x10^23 kg)(9.6x10^15 kg)/r^2

Solving for r = 9.4 x10^6 m

like poles repel so keep pushing north to north and repels funny to see this