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A concrete basement wall has thickness of 0.2 m. How much heat flows per square meter...

A concrete basement wall has thickness of 0.2 m. How much heat flows per square meter per second if the basement temperature is 25 ◦C and the ground temperate is 7 ◦C. Take the coefficient of conductivity of concrete to be 0.8 W m·K

(a) 72 J (b) 58 J (c) 25 kJ (d) 5.8 J (e) 1.8 J

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