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Physics (AS & A Level) · Oct / Nov 2024 · Paper 12 · Question 21

9702Stress and strain

Four solid steel rods equally support an object weighing 10 kN. Each rod is of length 2.0 m and cross-sectional area 250 mm2. The weight of the object causes the rods to contract by 0.10 mm. The rods obey Hooke's law. What is the Young modulus of steel?

  1. A2.0 × 10^8 N m–2
  2. B2.0 × 10^11 N m–2
  3. C8.0 × 10^8 N m–2
  4. D8.0 × 10^11 N m–2

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Correct answer: B. 2.0 × 10^11 N m–2

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