Some Properties of a Certain Glass Are Listed Here: Density $19 ^ { \circ } \mathrm { C }$

question 217

Multiple Choice

Some properties of a certain glass are listed here: Density 2300 kg/m³
Specific heat capacity 840 J/kg ? C°
Coefficient of thermal expansion 8.5 × 10^-6 (C°) ^-1
Thermal conductivity 0.80 W/m ? C°
A glass window pane is 2.7 m high, 2.4 m wide, and 9.0 mm thick. The temperature at the inner surface of the glass is $19 ^ { \circ } \mathrm { C }$ and at the outer surface 4°C. How much heat is lost each hour through the window?

• A)3.1 × 10^{7 J}
• B)3.1 × 10^{4 J}
• C)8.6 × 10^{3 J}
• D)8.6 J
• E)3.1 × 10^{5 J}

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