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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 °C. 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 influences the amount of heat conducted through the bottom of each pot is the temperature difference ∆T between the upper and lower surfaces of the pot s bottom. Is this temperature difference 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. |
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