On Law of universal gravitation?

Question

What is the force of gravity between Earth and the moon if the Moon's mass is 0.013 times that of Earth?
Show working

Answer 1

Gravitational pull or force is proportional to the product of the masses, that is m1, m2 and inversely proportional to the square of distance between them.

F=MxM/d (squared)

So what is missing here is the distance between the two bodies, the moon and earth and the mass of the earth. Look up the mass of the earth in kilograms.

mass of moon=.013x mass of earth in kilograms

so the F between the two is= M(earth) x M(moon) divided by the distance squared between them in meters

Answer 2

http://en.wikipedia.org/wiki/Law_of_universal_gravitation