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The temperature of an electronic oven is 160 °C. The temperature at the outer surface of the oven in the kitchen is 50 °C. The oven (surface area = 1.6 m2) is insulated with material that has a thickness of 0.020 m and a thermal conductivity of 0.045 J/(s m C°). How much energy will be used to operate the oven over six hours?

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