Homework Help: physic

Posted by firous on Wednesday, March 31, 2010 at 11:28pm.

In a house the temperature at the surface of a window is 25 °C. The temperature 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?

physic - drwls, Thursday, April 1, 2010 at 2:31am
To conduct twice the heat through the window, the temperature drop across the window glass must double from 20 C to 40 C. That will require that outside temperature becomes -15C
physic - kdjlf, Monday, January 7, 2013 at 6:41pm
-15C is right but how did you get it?

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