A-LevelPhysicsDeformation of solids9702/12 · Feb/Mar 2020 · Q191 Mark
A composite rod is made by attaching a glass-reinforced plastic rod and a nylon rod end to end, as shown. [Figure showing a glass-reinforced plastic rod and a nylon rod joined end-to-end, each 1.00 m long, with Young's moduli Ep = 40 GPa and En = 2.0 GPa respectively] The rods have the same cross-sectional area and each rod is 1.00 m in length. The Young modulus Ep of the plastic is 40 GPa and the Young modulus En of the nylon is 2.0 GPa. The composite rod will break when its total extension reaches 3.0 mm. What is the greatest tensile stress that can be applied to the composite rod before it breaks?
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.
A2.9 × 106 Pa
B5.7 × 106 Pa
C2.9 × 109 Pa
D5.7 × 109 Pa
✓ Correct answer
B: 5.7 × 106 Pa
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