Which of the following is not a recognised form of the second law of thermodynamics?
PHYSICS · Single correct · AP · Physics 2: Algebra-based · Thermodynamics · Thermodynamics
Problem
Which of the following is not a recognised form of the second law of thermodynamics?
(1) In any thermodynamic process, the entropy of a sample of gas always increases.
(2) It is not possible to make a heat engine that is 100% efficient.
(3) You can only transfer heat from a cold object to a hot one if you do some work on the cold object.
(4) The entropy of the universe always increases.