Newton Law Gravitation - Multiple choice question?? 1. The problem statement, all variables and given/known data 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 2. Relevant equations 3. 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/r2 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?