Physics HELP!! URGENT!!! Best answer to first correct.?

Question

Identical masses m hang from strings on a balance at the surface of Earth. The strings have negligible mass and differ in length by h. Assume that Earth is spherical, with density of 5.5 g/cm^3.

a) Show that the difference ∆W in the weights, due to one mass being closer to Earth than the other, is 8πGpmh/3

b) Find the difference in length that will give a ratio ∆W/W = 1*10^-6, where W is either weight

Answer 1

There's a physics category... you might be better off asking it there.