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?
a
1.2x \(10^{-1}cm\)
b
7.2x\(10^{-1}cm\)
c
6x\(10^{-1}cm\)
d
3.6x\(10^{-2}cm\)
e
1.8x\(10^{-1}cm\)
Explanation
Correct Option
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Discussions (16)
SUNSHINE 001
3 months ago
the answer is in cm, so we have to convert 3m to 300cm. so the answe is 0.18cm and the answer is not in the option
RiverHeights
2 years ago
Uh, if the temperature change is in celcius, then don't we convert it to kelvin since that's what the linear expansion coefficient is in?
Smasari27
3 years ago
Change in L is give as L2-L1 and l1 is given. When you cross multiply your also suppose to divide by l1 since L1 is given
