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A particular insulating container has a total surface area of 1.50 m2 and walls that are...

A particular insulating container has a total surface area of 1.50 m2 and walls that are 4.00 cm thick. Suppose that a 10.0 W electric heater keeps the inside of the container 10.0°C warmer than the temperature outside. What is the thermal conductivity k of the material that the container is made of? (Enter your answer in W/(m · °C).)

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