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 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 and outside is -12 $^{\circ}$ C.What is the radius of the window?

A) 47 cm
B) 53 cm
C) 27 cm
D) 7.1 cm
E) 84 cm

Correct Answer:

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