Problem 4.75- Copy * previous | 6 of 7 | next m Problem 4.75 - Copy Part A The 4

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Problem 4.75- Copy * previous | 6 of 7 | next m Problem 4.75 - Copy Part A The 40-ft-long A-36 steel rails on a train track are laid with a small gap between them to allow for thermal expansion. The cross-sectional area of each rail is 6.00 in2 (Eiqure 1) Determine the required gap so that the rails just touch one another when the temperature is increased from T-12to T-90 T Express your answer to three significant figures and include the appropriate units. 8- 0.095 in Submit My Answers Give Up Figure 1of Incorrect Try Again; 4 attempts remaining Provide Feedback Continue 40 ft-

Explanation / Answer

Coefficient of thermal expansion of steel = 7.2*10-6 /oF

Initial length of rail=40 ft=480 in

increase in length of rail=480*7.2*10-6*(90-(-12))=0.352 in

Therefore the gap between the rails should be equal to 0.352 in

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