2. If two different systems are put in thermal contact so that heat can flow from one to the other, then heat will flow until the systems have the same (a) energy. (b) heat capacity. (c) entropy. (d) temperature.
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Ans:
The heat will flow until the two systems have the same (d) temperature.
When heat flows no longer, the two systems are in thermal equilibrium, i.e. they have the same temperature.