Exam-style question
Try this first
In a required practical to determine the Young modulus of a metal rod, a force of 500 N is applied to a rod of cross‑sectional area 2.0 cm² and initial length 0.50 m. The rod elongates by 0.002 m. What is the Young modulus of the material?.
- A.2.5 × 10⁸ Pa
- B.5.0 × 10⁸ Pa
- C.7.5 × 10⁸ Pa
- D.1.0 × 10⁹ Pa
Model answer
What a good answer should say
- 5.0 × 10⁸ Pa.
- the correct option
Explanation
Why this works
The correct answer is 5.0 × 10⁸ Pa. 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
No common mistake is linked to this question yet.