Problem # 2: Consider a 5-m-high, 8-m-long, and 0.22-m-thick wall whose representative cross section is as given in the figure. The thermal conductivities of various materials used, in W/m C, are ka=kf= 2, ka = 8, ka= 20, kp = 15, and ke = 35. The left and right surfaces of the wall are maintained at uniform temperatures of 300C and 100C, respectively. Assuming heat transfer through the wall to be one-dimensional, determine (a) the rate of heat transfer through the wall; (b) the temperature at the point where the sections B, D, and E meet; and (c) the temperature drop across the section F. Disregard any contact resistances at the interfaces. 100C 300C D A4 cm 6 om F B 4 cm E c 60m 4 om lem. I am , 10 cm 5 6 cm Problem # 3: A 2-mm-diameter and 10-m-long electric wire is tightly wrapped with a 1-mm-thick plastic cover whose thermal conductivity is k = 0.15 W/m C. Electrical measurements indicate that a current of 10 A passes through the wire and there is a voltage drop of 8 V along the wire. If the insulated wire is exposed to a medium at To = 30C with a heat transfer coefficient of h= 24 W/m.C, determine the temperature at the interface of the wire and the plastic cover in steady operation. Also determine if doubling the thickness of the plastic cover will increase or decrease this interface temperature