In the section illustrated in figure 1, surface 1-4-7 is insulated, but surface 1-2-3 is sub- jected to convective heat transfer. The convective heat transfer coefficient at this surface is h = 28W/m²K. The thermal conductivity of the solid material is 5.2W/mK. Using numerical techniques, compute the temperatures of nodes 1,2 4 and 5, assuming that the temperatures along surface 3-6-9 and 7-8-9 are constant at 38°C. [7 marks] T∞ = = 0°C 2 h = 28W/m²K 3 1 5 7 300 8 mm 300 mm Figure 1: Steady conduction within a material subjected to convection on one side.