Consider an aluminum alloy fin (k=180 W/m.K) of triangular cross section with length L=5 cm, base thickness b=1 cm, and large width W, as shown in the following figure. The base of the fin is maintained at a temperature of T0=200oC. The fin is losing heat to the surrounding medium at T= 25oC with a heat transfer coefficient of h=15 W/m2.K. Using the finite different method with six equally spaced nodes along the fin in the x-direction, determine (a) the temperatures at the nodes, (b) the rate of heat transfer from the fin for W=1 m, and (c) the fin efficiency.