Exam-style question
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Which of the following best describes the relationship between mass and rest energy?.
- A.Rest energy is inversely proportional to mass.
- B.Rest energy is directly proportional to mass.
- C.Rest energy is independent of mass.
- D.Rest energy is proportional to the square of mass.
Model answer
What a good answer should say
- Rest energy is directly proportional to mass.
Explanation
Why this works
Formula: E = m c^2. Substitution: m is variable, c is constant.
Working: E ∝ m. Answer: Rest energy is directly proportional to mass.
Units: J. Conclusion: The rest energy increases linearly with mass.
Common mistake
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