A bridge made of steel is 600m long. What is the daily variation in its...
PHYSICS
JAMB 1992
A bridge made of steel is 600m long. What is the daily variation in its length if the night-time and daytime temperatures are 10°C and 35°C respectively. The linear expansivity of steel is 0.000012C\(^{-1}\).
- A. 0.18cm
- B. 1.80cm
- C. 18.00cm
- D. 1800cm
Correct Answer: C. 18.00cm
Explanation
\(\alpha\) = \(\frac{extension}{L\Delta\theta}\)
0.000012 = \(\frac{e}{600 \times (35 - 10}\)
= 0.18m
= (0.18 x 100) cm
= 18.0 cm
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