1. The problem statement, all variables and given/known data This is the exact problem: http://hyperphysics.phy-astr.gsu.edu/hbase/mechanics/earthole.html However, they assume that the Earth has a uniform density. I know how the density of the Earth varies with the distance from the center of the Earth. I also know the acceleration of gravity at each location within the Earth. However, how would I go about finding the period of oscillation as the mass falls through the Earth?