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Physics (AS & A Level) · May / June 2018 · Paper 12 · Question 20

9702Elastic and plastic behaviour

An elastic material with Young modulus E is subjected to a tensile stress S. Hooke's law is obeyed. What is the expression for the elastic energy stored per unit volume of the material?

  1. AE / (2S²)
  2. B2E / S²
  3. CS² / E
  4. DS² / (2E)

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Correct answer: D. S² / (2E)

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