Two pots are identical, except that in one case the fl at

Chapter , Problem 46

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Two pots are identical, except that in one case the fl at bottom is aluminum and in the other it is copper. Each pot contains the same amount of boiling water and sits on a heating element that has a temperature of 155 8C. In the aluminum pot, the water boils away completely in 360 s. Concepts: (i) Is the heat needed to boil away the water in the aluminum-bottom pot less than, greater than, or the same as the heat needed in the copper-bottom pot? (ii) One of the factors in Equation 13.1 that infl uences the amount of heat conducted through the bottom of each pot is the temperature diff erence DT between the upper and lower surfaces of the pots bottom. Is this temperature diff erence for the aluminum-bottom pot less than, greater than, or the same as that for the copper-bottom pot? (iii) Is the time required to boil away the water completely in the copper- bottom pot less than, greater than, or the same as that required for the aluminum-bottom pot? Calculations: Find the time it takes the water in the copper-bottom pot to boil away completely.