Why can't the heat from a cup of tea that has cooled be used to reheat it?

  1. the first law forbids it
  2. the energy was destroyed
  3. heat has no energy
  4. the energy is spread out at low temperature (degraded)
Answer

D) the energy is spread out at low temperature (degraded)

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