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Physics (AS & A Level) · Oct / Nov 2021 · Paper 13 · Question 20

9702Stress and strain

Which spring combination has an overall spring constant of 8.0 N m⁻¹?

  1. ATwo springs in series, each with extension = 0.20 m, total load 1.6 N
  2. BTwo springs in parallel, each with extension = 0.075 m, load 1.2 N
  3. CTwo springs in parallel (each extension = 0.075 m) in series with a third spring (extension = 0.15 m), load 1.8 N
  4. DTwo pairs of springs in parallel, each spring extension = 0.075 m, load 2.4 N

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Correct answer: C. Two springs in parallel (each extension = 0.075 m) in series with a third spring (extension = 0.15 m), load 1.8 N

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