2. A composite consisting of five sections, as shown in the figure below. K1=K2=K3= K4=K5=150W/mK and A1=A2=A3=A4=A5=0.01m2 and, L1=L2=L3=L4=L5=0.2m a) Construct the thermal circuit model. b) Find the final expression of total resistance. c) If Ti=120C and Tf=30C, calculate the rate of heat transfer of the composite