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a wall is made with three layers of material. The tempurature on one side of the...


a wall is made with three layers of material. The tempurature on one side of the wall is 30 degrees celcius and on the other side is -15 degrees celcius. Starting at the warm side, the first material has a thickness L1 and the thermal conductivity k1, the second material has thickness L2= 0.7L1 and thermal conductivity k2=0.9k1, and tge third material (one the cold side of the wall) has L3= 0.35L1 and thermal conductivity k3=0.8k1. What is the temperature difference across layer 2?
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