【Daily Question】Theoretical Foundation 2020.05.21
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This post was last edited by Qingse Nianhua on 2020-5-21 08:28. Multiple-choice question: Regarding the second law of thermodynamics, the following statements are given: (1) Work can be completely converted into heat, but heat cannot be completely converted into work； (2) The efficiency of all heat engines cannot equal 1 ； (3) Heat cannot be transferred from a colder object to a hotter one ； (4) The transfer of heat from a hot object to a cold object is irreversible. Among the above statements, A. Only (2) and (4) are correct. B. Only (2), (3), and (4) are correct. C. Only (1), (3), and (4) are correct. D. All are correct. Answer: A Hint: Extra rewards will be given to those who can explain the problem-solving process; the answer can be seen there!
A. Only (2) and (4) are correct