A-LevelPhysicsDeformation of solids9702/12 · May/June 2017 · Q191 Mark

A cable on a suspension bridge supports a weight of 19.3 × 10⁵ N. This weight causes the cable to stretch by 47 mm. A lorry crossing the bridge then increases the force on the cable to 23.3 × 10⁵ N. The force-extension graph for the cable is shown. [Figure shows a force/N versus extension/mm graph. It is a straight line passing through (0,0), (47 mm, 19.3 x 10⁵ N) and (57 mm, 23.3 x 10⁵ N).] What is the increase in strain energy in the cable when the lorry is crossing the bridge?

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A21 kJ

B23 kJ

C45 kJ

D66 kJ

✓ Correct answer

A: 21 kJ

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Topic: Deformation of solids, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2017 Paper 1 Variant 2, question 19.

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