A 1500 W Portable Heater Is Needed to Replace the Heat

A 1500 W portable heater is needed to replace the heat lost through a circular window (radius 25 cm) in the wall of a home that is made of a single pane of glass 0.30 cm thick.Thermal conductivity for the glass is 0.63 W/mK.The temperature inside the house is 20 $^{\circ}$ C.What is the temperature outside?

A) -3 $^{\circ}$ C
B) -16 $^{\circ}$ C
C) 16 $^{\circ}$ C
D) 11 $^{\circ}$ C

Correct Answer:

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