1. The problem statement, all variables and given/known data Please see images - full problem statement given. Summary: I have to calculate TL for an adiabatic tip extended surface I found all the equations for points 1-6 but cannot figure out 7. 2. Relevant equations 1st BC: θ(0) = Tb - T∝ 2nd BC: x=L 3. The attempt at a solution If it is an adiabatic tip, the formula from Fourier's Law is dθ/dx = 0 (@x=L) It is case specific which in mine is an adiabatic tip (no heat release from the tip) I don't get why I am being asked to calculate for TL then...can someone please clarify.