FYKOS Year 37 Series 2 Problem 3 — decaying planet · FYKOS 37 #37.2.3

Physics · mechanics · thermodynamics

Problem

Consider a planet with the same total mass and radius as the Earth. How much uranium

\ce{^238U}

would it have to contain, so that its surface temperature is

15\,\mathrm{^\circ\mskip-2mu\mathup{C}}

, assuming it is not lit by any nearby star.