In cold climates, ski clothing made up of several thin layers of fabric with trapped air in between has largely replaced thick and heavy old-fashioned coats, because it is light, fashionable, and a very effective thermal insulator. Consider a ski jacket made of five layers of 0.10-mm-thick synthetic fabric (ksf=0.14 Wm 'K) that are separated by 1.8-mm-thick air spaces (ka = 0.030 WmK-). a. If the inner and outer surface temperatures of the jacket are 30C and -5C, respectively, estimate the rate of heat loss from a ski jacket with a surface area of 1.0 m. How would the rate of heat loss through the ski jacket compare to that for a jacket made of a single layer of 0.50-mm-thick synthetic fabric? b. What should be the thickness of a single layer of wool fabric (k = 0.040 Wm 'K) if the same level of thermal comfort is to be achieved with a wool coat instead of a ski jacket? c. Compare your responses in part (a) to those for a similar jacket made up of layers of cotton fabric (kw 0.060 WmK). Based on your results, what is predominantly responsible for the large overall thermal resistance of the ski jacket?