FYKOS Year 26 Series 2 Problem 2 — hollow Earth · FYKOS 26 #26.2.2

Physics · mechanics

Problem

Imagine that all the mass of the Earth is remodeled into a spherical shell. The thickness of the shell is

d=1\;\mathrm{km}

. Assume the density remains the same, what is the outer radius of the new planet? What is the gravitational acceleration on its surface?