Exam-style question
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An engine does 1500 J of useful work while consuming 6000 J of energy. Calculate the efficiency of the engine.
Model answer
What a good answer should say
- 25%
Explanation
Why this works
This question assesses the ability to apply the efficiency formula in a practical context. The efficiency is determined by the ratio of useful work output to energy input, expressed as a percentage.
Common mistake
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