The half-cylinder has k =20W/m· C and is exposed to the convection environment at 20?C. The lower surface is maintained at 300?C. Compute the temperatures for the nodes shown in Figure P3-66 and the heat loss for steady state. Repeat Problem 3-67 with the inside of the tube exposed to a convection condition with h=40 W/m2 · C. Check with an analytical calculation