Which is consistent with the second law?

  1. an engine with 100% efficiency
  2. a hot drink cooling to room temperature
  3. a cold drink spontaneously warming above room temperature
  4. heat flowing from ice to a hot stove
Answer

B) a hot drink cooling to room temperature

Natural direction of heat flow. SLO P-11-C-15 · Understanding

Physics MCQ · More Heat Engines, Second Law and Entropy MCQs · Practise