Consider a horizontal 5-mm-thick, 100-mm-longAÈraight fin fabricated from plain carbon steel (k = 37Wim-K, E = 0.5). The base of the fin is maintained at 100°C, while the quiescent ambient

ait and the surroundings are at 25°C. Assume the fin tip is adiabatic,and estimate the fin heat rate per unit width, Use un average tin surface temperature of 8O"C to estimate the free convection coefficient and the linearized radiation coefficient. How sensitive is your estimate to the choice of the average fin surface temperature?