1. The problem statement, all variables and given/known data Suppose the earth is a perfect sphere with R=6370 km. If a person weighs exactly 600.0N at the north pole, how much will the person weigh at the equator? (Hint: the upward push of the scale on the person is what the scale will read and is what we are calling the weight in this case.) 2. Relevant equations Fg = Gm1m2 / r^2 Fg = mg 3. The attempt at a solution This was my belief: that since in the question the earth is presumed to be a perfect sphere, it means the radius will be constant at all points of the surface. Therefore, shouldn't the weight stay the same? But the answer to the question is 597.9 N, not 600.0 N and I just don't understand how. I have a feeling it might have something to do with the normal force, but I'm not sure.