PLEASE SOLVE CLEARLY.....

a. A vertical, flat fin of aluminum extending out from a tube is in contact with air at 20C at 1 atm. The fin length is 0.1m and its temperature is approximately uniform at 60C. Calculate the heat transfer coefficient. b. Consider a rectangular fin with L as the length of the fin. Assume the heat flow is along length and heat transfer coefficient (h) on the surface of the fin is constant. How do heat transfer from the fin (Q) and fin efficiency change if the length of the fin increased to 2L? NGrG=L32gT/2NNu=a(NPrPr)m Physical properties of air at 1atm