1. The problem statement, all variables and given/known data A hollow cylinder of length L has inner radius, r1, outer radius, r2 , and thermal conductivity, k. It is in dynamic thermal equilibrium, with its interior held at temperature T1 and its exterior at a different temperature, T2. What is the radial temperature dependence, T(r), within the cylinder, r1 ≤ r ≤ r2 ? 2. Relevant equations Heat Current = KA(T-T)/L 3. The attempt at a solution I know heat current out equals heat current in and than you solve for T. However, I cannot figure out how to calculate the heat currents since the area is changing.