thermal energy

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1a. what is the rate of energy loss in wattm^-2 through a glass window 3.00mm thick if the outside temp is -20^0c and inside temp is 25^0c.
b.) A storm window having the same thickness of glass is installed parallel to the first window with an air gap of 7.5cm between the two windows.what is the rate of energy loss if condition is the only energy loss mechanism

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