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10-m-long steel rails of a railroad track (Es = 200 GPa and αs = 11.7×10-6/°C) were laid at a temperature of 7.5°C. a) Determine the normal stress in the rails when the temperature reaches 48°C, assuming that the rails are welded to form a continuous track.  b) Determine the normal stress in the rails when the temperature reaches 48°C, assuming that the rails are 10 m long with 3-mm gaps between them.

10-m-long steel rails of a railroad track (Es = 200 GPa and αs = 11.7×10-6/°C) were laid at a temperature of 7.5°C. a) Determine the normal stress in the rails when the temperature reaches 48°C, assuming that the rails are welded to form a continuous track.  b) Determine the normal stress in the rails when the temperature reaches 48°C, assuming that the rails are 10 m long with 3-mm gaps between them.

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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10-m-long steel rails of a railroad track (Es = 200 GPa and αs = 11.7×10-6/°C) were laid at a temperature of 7.5°C.

a) Determine the normal stress in the rails when the temperature reaches 48°C, assuming that the rails are welded to form a continuous track. 

b) Determine the normal stress in the rails when the temperature reaches 48°C, assuming that the rails are 10 m long with 3-mm gaps between them.

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