Ocean water has a huge internal energy, but a ship can't run on it alone because:

  1. the energy is too small
  2. the first law forbids it
  3. water doesn't contain energy
  4. there is no colder reservoir to reject heat to
Answer

D) there is no colder reservoir to reject heat to

Second law. SLO P-11-C-15 · Understanding

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