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Copper has a linear expansion coefficient of 17 * 10⁻⁶ per degC. A copper statue 93 m tall on a summer morning at 25 degC heats up to a daytime maximum of 45 degC. What is the maximum order of magnitude of the increase in its height?

1. 0.1 mm
2. 1 mm
3. 10 mm
4. 100 mm

Correct answer: 10 mm

Solution

delta_L = 93 * 17e-6 * 20 ≈ 0.0316 m ≈ 31.6 mm, whose order of magnitude is ~10 mm.

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