Steel bars each of length 3m at 28°C are to be used for constructing a rail line. If the linear expansitivity of the steel is 1 x $10^{-5}K^{-1}$ ,what is the safety gap that must be left between the successive bars if the highest temperature expected is 40°C?

1.2x $10^{-1}cm$

7.2x $10^{-1}cm$

6x $10^{-1}cm$

3.6x $10^{-2}cm$

1.8x $10^{-1}cm$

Correct answer is D

$\alpha= \frac{\Delta{L}}{L_1\Delta\theta}; \Delta{L}=\alpha{L_1}\Delta\theta\Rightarrow 1.0\times 10^{-5}\times 300\times (40-28)= 0.036 or 3.6\times 10^{-2}$

See all Physics questions & answers

See more WAEC questions & answers

Steel bars each of length 3m at 28°C are to be used for constructing a rail line. If the linear expansitivity of the steel is 1 x $10^{-5}K^{-1}$ ,what is the safety gap that must be left between the successive bars if the highest temperature expected is 40°C?

Similar Questions

Aptitude Tests

Steel bars each of length 3m at 28°C are to be used for constructing a rail line. If the linear expansitivity of the steel is 1 x 10−5K−110^{-5}K^{-1},what is the safety gap that must be left between the successive bars if the highest temperature expected is 40°C?

Similar Questions

Aptitude Tests

Steel bars each of length 3m at 28°C are to be used for constructing a rail line. If the linear expansitivity of the steel is 1 x $10^{-5}K^{-1}$ ,what is the safety gap that must be left between the successive bars if the highest temperature expected is 40°C?