AP Environmental Scienceeasymcq1 pt
The second law of thermodynamics implies that
A.every energy conversion loses some energy to heat
B.energy can be created
C.machines can be perfectly efficient
D.heat never flows anywhere
Explanation
Core Concept
No engine converts all input into useful work; some always degrades to waste heat — why efficiency can never reach 100%.
Correct Answer
Aevery energy conversion loses some energy to heat
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