Question: You are to size fins of a rectangular cross section to remove a total of 200W from a 400-an2 surface whose temperature is to be kept at 80°C. The temperature of the surrounding air is 25°C, and you may assume that the natural convection coefficient value is 25 W/m2 • K. Be-cause of restrictions on the amount of space, the fits cannot be extended more than 100 mm from the hot surface. You may select from the following materials: aluminum, copper, or steel. In a brief report, explain how you came up with your final design.