Problem 2 (30 points) The cooling of an electronic device is improved by installing aluminum fins, as shown in the Figure. There are 10 fins. Each fin has a longitudinal length (ie. along the axis of the cylindrical device) of 5 cm, a peripheral length (ie. along the radial direction) of 2 cm, and is 2 mm thick. The base surface of the fins is 100C and the whole device is heated by blowing 30C air with h = 15 W/(m K). The radius of the electronic device is 3 cm. Determine: a) The heat transfer from a single fin. (18 pts) b) The effectiveness of a single fin. (3 pt) c) The efficiency of a single fin. (3 pt) d) The % increase in heat transfer by the addition of the fins. (6 pts)