Conduction of Heat: Some Properties of Glass Are Listed Here

question 13

Multiple Choice

Conduction of heat: Some properties of glass are listed here. Density: 2300 kg/m³
Specific heat: 840 J/kg · °C
Coefficient of linear 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 2.0 mm thick. The temperature at the inner surface of the glass is and at the outer surface 4.0°C. How much heat is lost each hour through the window under steady state conditions?

• A) 1.7 × 10^{8 J}
• B) 1.7 × 10^{5 J}
• C) 4.7 × 10^{4 J}
• D) 4.7 × 10^{1 J}
• E) 1.7 × 10^{6 J}

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Definitions:

Average Operating Assets

The average value of the assets used in the normal operations of a business, calculated over a specific period.

Market Price

The current value at which an asset or service can be bought or sold in the marketplace.

Preferred Dividends

The dividends that are allocated and paid to preferred shareholders before any dividends can be distributed to common shareholders.

Retained Earnings

The portion of net income not distributed as dividends to shareholders, but instead reinvested in the company or kept as reserve.