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Mathematics 21 Online
OpenStudy (anonymous):

A system consists of a copper tank whose mass is 29 lbm, 9 lbm of liquid water, and an electrical resistor of negligible mass. The system is insulated on its outer surface. Initially, the temperature of the copper is 81 F and the temperature of the water is 122 F. The electrical resistor transfers 95 Btu of energy into the system. Eventually the system comes to equilibrium. Determine the final equilibrium temperature, in F.

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