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A 32 inches wide by 76 inches high by 3.5 inches thick solid oak door has an interior temperature of 85F and an exterior

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A 32 inches wide by 76 inches high by 3.5 inches thick solid oak door has an interior temperature of 85F and an exterior temperature 32F. The heat flux across the door is 24.7 BTU/hr ft2. What is the thermal conductivity of the door?

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