1. The problem statement, all variables and given/known data Calculate the radius of the Earth's core using the following data: Pe = 5,515 kg/m^3 (earth's average density) Pc = 11,000 kg/m^3 (core's density) Pm = 4,450 kg/m^3 (mantle-crust density) Re = 6377km (radius of the earth) 2. Relevant equations im guessing we should be using the gravitational equation g = (GM)/r^2 for different shells (might be wrong) g= gravitational acceleration G= Gravitational constant M = mass of sphere with radius of "r" r= radius 3. The attempt at a solution i tried the above equation but got no where with this. i need help!!!