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

question 20

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 thermal energy 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}

---

Definitions:

Perfect Competition

A market structure characterized by a complete absence of rivalry among the producers, with many buyers and sellers, each of whom has a negligible impact on the market.

Identical Service

A service that is exactly the same in every feature and aspect when compared to another service.

Efficient Output

The level of production at which a company or economy can produce goods at the lowest possible cost per unit, maximizing the allocation of resources.

Perfect Competitor

A hypothetical firm in a perfectly competitive market that cannot influence the market price of its product and takes the market price as given.