Two blocks at different temperatures are placed in contact in an insulated box. Heat flows until
Correct answer: B. both reach the same temperature
- A. the block with more mass becomes hotter
- B. both reach the same temperature
- C. both reach the same internal energy
- D. the hotter block loses all its energy
Explanation
Transfer continues only while a temperature difference exists, so equilibrium is reached when the temperatures match, not when the energies do. The heat lost by the hotter block equals the heat gained by the cooler one, which is the principle used in calorimetry. The final temperature depends on both masses and both specific heat capacities.
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About Thermal Equilibrium and Heat
Thermal equilibrium means that bodies in contact have the same temperature and no net heat flows between them. The topic distinguishes heat from temperature, uses the zeroth law of thermodynamics, and covers heat transfer, specific heat capacity, thermal expansion and the conditions for reaching equilibrium.
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