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A glass window pane is 1.2 m wide, 1.5 m wide and 3 mm thick. The temperature at the inner surface of the glass is 22^oC and at the outer surface 4oC. How much heat is lost each hour through the window? The density of glass is 2300 kg/m³, the specific heat is 840 J/kgC, the coefficient of linear expansion is 8.5 x 10^-61/C and thermal conductivity is 0.80 J/smC.

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