A rectangular slab 50 by 75 cm is shown in Figure P3.49. Th e top surface is maintained at 100°C; the left and lower surfaces are at 50°C. Th e right surface is insulated. Divide the region into six...

A rectangular slab 50 by 75 cm is shown in Figure P3.49. Th e top surface is maintained at 100°C; the left and lower surfaces are at 50°C. Th e right surface is insulated. Divide the region into six squares and write the fi nite-diff erence equations for each node.