Consider a horizontal 5-mm-thick, 100-mm-long straight fin fabricated from plain carbon steel ( = 57 /). The base of the fin is maintained at 100, while the quiescent ambient air and the surroundings are at 25. Assume the fin tip is adiabatic and use an average fin surface temperature of 350K to estimate the free convection coefficient. PROPERTIES: Table A-4, Air ( = 350): = 20.92 106 2/, = 29.9106 2/, =0.030 /, Pr = 0.70, = 1/