Exam-style question
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A heat engine receives 5000 J of energy input and does 2000 J of useful work. Calculate the efficiency of the engine.
Model answer
What a good answer should say
- 40%
Explanation
Why this works
This question tests the understanding of efficiency calculation in thermodynamic processes. The efficiency is calculated using the formula for efficiency, which is the ratio of useful work output to total energy input, multiplied by 100.
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