A-LevelPhysicsDeformation of solids9702/12 · Oct/Nov 2015 · Q241 Mark
A 0.80 m length of steel wire and a 1.4 m length of brass wire are joined together. The combined wires are suspended from a fixed support and a force of 40 N is applied, as shown. [Figure showing a steel wire joined to a brass wire, suspended from a support, with a 40N force applied] The Young modulus of steel is 2.0 × 10¹¹ Pa. The Young modulus of brass is 1.0 × 10¹¹ Pa. Each wire has a cross-sectional area of 2.4 x 10⁻⁶ m². The wires extend without reaching their elastic limits. What is the total extension? Ignore the weights of the wires.
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
A1.7 × 10⁻⁴ m
B3.0 × 10⁻⁴ m
C3.9 × 10⁻⁴ m
D9.0 × 10⁻⁴ m
✓ Correct answer
B: 3.0 × 10⁻⁴ m
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