2(30pts). A hot surface at 250C is to be cooled by attaching straight aluminum rectangular fins (k=240W/mK) with 25mm length, 50mm width and 4mm base thickness. Fins are exposed to an ambient air condition of 30C and heat transfer coefficient is 40W/m2K. If there are 2000 fins per m2 surface area, calculate; a. The heat transfer rate from a single fin. b. The increase in the rate of heat transfer per m2 surface area as a result of attaching 2000 fins. c. Determine the overall effectiveness of the fins