Steel bars, each of length 3.0 m at 28°C, are to be used for constructing
PHYSICS
WAEC 1992
Steel bars, each of length 3.0 m at 28°C, are to be used for constructing a rail line. If the linear expansivity of steel is 1.0 x 10-5°C, what is the safety gap that must be left between successive bars if the highest temperature expected is 40oC?
- A. 1.2 x 10-1cm
- B. 8.4 x 10-2cm
- C. 7.2 x10-2cm
- D. 3.6 x 10-2cm
Correct Answer: D. 3.6 x 10-2cm
Explanation
Gap ?L = ?L1?? = 1.0 x 10-5 x 3 x (40 - 28)
= 3.6 x 10-2
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