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A 1500 W portable heater is needed to replace the heat lost through a circular window...

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. The thermal conductivity for the glass is 0.63 W/mK. The temperature inside the house is 20 oC and outside is −12 oC. What is the thickness of the window?

Multiple Choice

2.6 mm

0.66 mm

4.2 mm

0.84 mm

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