Consider a very long rectangular fin attached to a flat surface such that the temperature at the end of the fin is essentially that of the surrounding air, i. e. 20°c. its width is 5.0cm; thickness is 1.0mm; thermal conductivity is 200w/mk; and base temperature is 40°c. the heat transfer coefficient is 20w/m^2k. estimate the fin temperature at a distance of 5.0cm from the base and the rate of heat loss from the entire fin.