A box with a total surface area of 1.20 m2 and a wallthickness of 4.00 cm is made of an
Chapter 20, Problem 52(choose chapter or problem)
A box with a total surface area of 1.20 m2 and a wallthickness of 4.00 cm is made of an insulating material.A 10.0-W electric heater inside the box maintains theinside temperature at 15.0C above the outside temperature.Find the thermal conductivity k of the insulatingmaterial.
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