Exam-style question
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A steel rod has a Young modulus of 2.0 × 10¹¹ Pa. If a tensile stress of 4.0 × 10⁸ Pa is applied, what is the resulting strain?.
- A.0.0002
- B.0.002
- C.0.02
- D.0.2
Model answer
What a good answer should say
- 0.002.
- the correct option
Explanation
Why this works
The correct answer is 0.002. This supports Required practical 4: determine the Young modulus of a material.
in The Young modulus because it uses the required mechanics relationship directly. The other options are less suitable because they confuse a different force, motion, energy, momentum, or materials concept.
Common mistake
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