1. The problem statement, all variables and given/known data Two ends of a bar of length L are held at temperatures To and TL at positions x=o and x=L, respectively. Thermal conductivity k(x)= Ko/(1+ x/L) , ko is a constant. cross section of the bar is uniform and longs sides are thermally insulated, there's no source of heat within the bar. a. what differential relation describes the temperature as a function of position in the bar b. Solve the system for temperature distribution, T(x), in terms of To, TL, L and Ko 2. Relevant equations -Dq+Q=0 q=-deltaT Not sure... 3. The attempt at a solution This is a HW from finite element course. I really don't know how to start with k is nonuniform.