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In a house the temperature at the surfac...

In a house the temperature at the surface of a window is `25^(@)C` The temperatuere outside at the window surface is `5.0^(@)C` .Heat is lost through the window via conduction, and the heat lost per second has a certain value. The temperature outside begins to fall, while the conditions inside the house remain the same. As a result, the heat lost per second increases. What is the temperature at the outside window surface when the heat lost per second doubles ?

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