Assume for the sake of having values for this problem that an old railroad track was...

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Assume for the sake of having values for this problem that an old railroad track was made using cast iron rails with properties equivalent to ASTM A-197 cast iron. Assume that the gap is 8-0.25in at 60°F. Assume that the rails can stretch or shrink freely. The rail weighs 60lbf per yard of length. ||-8 40 ft- 8|| a. What cross-sectional area does the rail have based upon its specific weight and weight per unit length? b. At what temperature will the rails touch w/o force (8=Oin)? c. At what temperature will the gap increase to 6=0.5in? d. At what temperature will the normal stress in the rails exceed the ultimate strength of the material in compression? Assume for the sake of having values for this problem that an old railroad track was made using cast iron rails with properties equivalent to ASTM A-197 cast iron. Assume that the gap is 8-0.25in at 60°F. Assume that the rails can stretch or shrink freely. The rail weighs 60lbf per yard of length. ||-8 40 ft- 8|| a. What cross-sectional area does the rail have based upon its specific weight and weight per unit length? b. At what temperature will the rails touch w/o force (8=Oin)? c. At what temperature will the gap increase to 6=0.5in? d. At what temperature will the normal stress in the rails exceed the ultimate strength of the material in compression?