Problem 1 (20 points) The end of a rectangular bar surrounded by insulation is maintained at 100 C and is exposed to ambient air as shown in the schematic. A linear array of pin fins (N =10) is affixed to the end surface to enhance the heat transfer rate from the bar. The pin fins (k = 65 W/m.K) are 3 mm in diameter and 12 mm long. The ambient air temperature is 25 C, and the convection coefficient over the bar end surface and pin fins is 10 W/m K. Determine: a) The effectiveness of a single fin b) The efficiency of a single fin W-63 m Bad 14 mar, To Ps Fae, A TA c) The percentage increase in the heat transfer rate associated with attaching the fins to the bar end. d) Temperature of the tip of the fins im