The second law of thermodynamics implies that:
Correct answer: B. Heat flows spontaneously from hot to cold
- A. All heat can be converted to work
- B. Heat flows spontaneously from hot to cold
- C. Internal energy is always conserved
- D. Work cannot be converted to heat
Explanation
The second law states that heat flows spontaneously from a hotter body to a colder one, increasing the entropy of the universe, unless external work is done to reverse the process.
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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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