Determine the magnitude and direction of the gravitational force exerted a) on the Moon by Earth and b) on Earth by Moon.

Answer 1

The forces are the same, but in opposite directions. The Earth pulls the moon and vice versa.

The force is G*M*m/R^2
G = universaL constant of gravity
m = lunar mass
M = Earth mass
R = earth-moon separation

The force also equals m*V^2/R
where V is the velocity of the moon its orbit.

Answer 2

I did not get the answer...