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phys124s11-hw09

# phys124s11-hw09 - HW 9 Solutions Understanding Heat...

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1 HW 9 Solutions Understanding Heat Conduction Conduction--the flow of heat from a hotter object to a cooler object or from a hotter region to a cooler region of the same object--is the most common mechanism of heat transfer. The formula governing this is CH H C C dQ T T k A dt L = . a) This formula applies to ________________. any object of cross-sectional area ; length ; and thermal conductivity any object of cross-sectional area ; length ; and thermal resistivity a plate of surface area ; long dimension ; and thermal conductivity a plate of surface area ; long dimension ; and thermal resistivity Imagine that you are applying the heat conduction formula to a rod that is held at a high temperature on one end and at a low temperature on the other end. Indicate whether the following statements are true or false. b) The quantity CH dQ dt is the rate of heat transfer from the hot to the cold end of the rod. true false c) The quantity CH dQ dt is the rate of heat added to the hot end of the rod to maintain its temperature. true false d) The quantity CH dQ dt is the rate of heat removed from the cold end of the rod to maintain its temperature. true false e) The quantity CH dQ dt is the total amount of heat transferred from the hot to the cold end of the rod.

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