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**Newton Law Gravitation - Multiple choice question??**

## Homework Statement

Newton’s law of gravitation can be applied to the Earth-Moon system. Which of the

following statements is not correct?

A The value of G at the surface of the Moon is the same as that at the surface

of the Earth.

B The gravitational force between the Earth and the Moon is proportional to the

square of the separation of the Earth and the Moon.

C The gravitational force between the Earth and the Moon is proportional to the

mass of the Moon.

D The orbital time of the Moon about the Earth is independent of the mass of

the Moon

## Homework Equations

## The Attempt at a Solution

Lets go through all the options:

A: G is constant so option A is is not the answer

B: F = GMm/r

^{2}so option B is is not the answer

C: using the same equation as above, option C is is not the answer

D: T =

^{4∏2r3 }/

_{GM}where M = mass of earth so option D is not the answer

**The answer turns out to be B. Why?**