A 1,500 W Portable Heater Is Needed to Replace the Heat

A 1,500 W portable heater is needed to replace the heat lost through a circular window (radius 25 cm) in the wall of a home. The window is made of a single pane of glass 0.30 cm thick. The thermal conductivity for the glass is 0.63 W/(m·K) . The temperature inside the house is 20 °C. What is the temperature outside?

A) −3 °C
B) −16 °C
C) 16 °C
D) 11 °C

Correct Answer:

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