# Heat Transfer

**Classical Mechanics**Level 3

A point source of heat of power \(P\) is placed at the center of a spherical shell of mean radius \(R\). The material of the shell has thermal conductivity\( K\). Calculate the thickness of the shell if the temperature difference between the outer and inner shell in steady state is \(T\).

The thickness \(t \) can be given by: \(\frac{A R^2 K T}{P}\), where \(A\) is a constant.

Find the value of \(A\) correct upto three decimal places.