A-LevelPhysicsDeformation of solids9702/12 · May/June 2016 · Q211 Mark
A metal wire is attached at one end to a fixed point and a load is hung from the other end so that the wire hangs vertically. The load is increased from zero to 20 N. This causes the wire to extend elastically by 5.0 mm. The load is then reduced to 12N and the extension decreases to 3.0 mm. [Figure 21.1] How much strain energy is released during the unloading process?
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A0.8 × 10⁻² J
B1.8 × 10⁻² J
C2.4 × 10⁻² J
D3.2 × 10⁻² J
✓ Correct answer
D: 3.2 × 10⁻² J
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