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A certain material has a thermal conductivity of 0.90 W/(m oC). If the area of a...

A certain material has a thermal conductivity of 0.90 W/(m oC). If the area of a wall made of the material is 20 m2, the thickness of the wall is 0.6 m, and the heat transfer through that wall by conduction is 400 W, what is the temperature difference between the surfaces of the wall? Give your answer in terms of oC . (Enter the number only -- do not include the units in your answer.)

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