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Physics 6 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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