Which of the following best supports the idea that there is no 100% efficient engine?
A. In reality, there is no 100% efficient engine because the change in internal energy of a system equals the difference between the heat taken in by the system and the work done by the system
B. In reality, there is no 100% efficient engine because there is only heat transfer from hot to colder objects
C. In reality, there is no 100% efficient engine because there will be other losses (to friction, for example) that will reduce the efficiency.
D. In reality, there is no 100% efficient engine because any external energy is not required to happen
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Answer:
it's B OR D
Explanation:
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