A steel measuring tape is correct at 20 °C. On a 45 °C day a surveyor uses it and reads 80.000 m. What is the true distance? (α = 1.2 × 10⁻⁵ K⁻¹.)

PhysicsHardHigh School (11–12)Heat & Thermodynamics › Temperature and Thermal Expansion

A steel measuring tape is correct at $20\ ^\circ\text{C}$ . On a $45\ ^\circ\text{C}$ day a surveyor uses it and reads $80.000\ \text{m}$ . What is the true distance? ( $\alpha = 1.2 \times 10^{-5}\ \text{K}^{-1}$ .)

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← A glass flask of 100 cm³ is filled to the brim with mercury and heated by 50 K. How much mercury spills? (γ of mercury 1.8 × 10⁻⁴ K⁻¹; α of glass 0.9 × 10⁻⁵ K⁻¹.)A pendulum clock with a steel rod keeps correct time at 20 °C. How many seconds does it lose in a day at 40 °C? (α = 1.2 × 10⁻⁵ K⁻¹; T ∝ √L.) →

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