As shown in Fig. P3.91, a closed, insulated tank contains

Chapter 3, Problem 3.91

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As shown in Fig. P3.91, a closed, insulated tank contains 0.15 kg of liquid water and has a 0.25-kg copper base. The thin walls of the container have negligible mass. Initially, the tank and its contents are all at \(30^{\circ} \mathrm{C}\). A heating element embedded in the copper base is energized with an electrical current of 10 amps at 12 volts for 100 seconds. Determine the final temperature, in \(^{\circ} \mathrm{C}\), of the tank and its contents. Data for copper and liquid water are provided in Table A-19.

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