A-LevelPhysicsDeformation of solids9702/12 · May/June 2020 · Q181 Mark

An elastic cord of unstretched total length 16.0 cm and cross-sectional area 2.0 × 10⁻⁶ m² is held horizontally by two smooth pins a distance 8.0 cm apart. The cord obeys Hooke's law. A load of mass 0.40 kg is suspended centrally on the cord. The angle between the two sides of the cord supporting the load is 60°. [Figure 18.1] What is the Young modulus of the cord material?

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A5.7 × 10⁵ Pa

B1.1 × 10⁶ Pa

C2.3 × 10⁶ Pa

D3.9 × 10⁶ Pa

✓ Correct answer

C: 2.3 × 10⁶ Pa

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Topic: Deformation of solids, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2020 Paper 1 Variant 2, question 18.

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