An iron railroad rail is 790 ft long when the temperature is 40°C. What is its...
An iron railroad rail is 790 ft long when the temperature is 40°C. What is its length (in ft) when the temperature is −17°C? (Round your answer to at least one decimal place.)
Homework Answers
Given,
The length of an iron rail road, L0 = 790 ft
Temperature T1 = 40 oC and T2 = -17 oC
The coefficient of thermal expansion of iron, a = 12 * 10-6 /C
We know,
L = Lo ( 1 + a 
T)
= 790 (1 + 12 * 10-6 (40 + 17))
= 790 (1 + 12 * 10-6 (57))
= 790.54 ft
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