Which of the following best explains why some railroad tracks are laid down
with gaps between the metal rail spans?
A. To allow for the metal tracks to expand on hot days.
B. To allow for the metal tracks to expand on cold days.
C. To allow for cooling of the tracks by air in the gaps.
D. To allow for vibration of the tracks due to the train
Answers
Answered by
1
Answer:
A. To allow for the metal tracks to expand on hot day
Explanation:
These gaps which are of the order of a few millimetres, are provided to allow room for the rails to expand the rise in temperature due to the atmospheric temperature as well as the friction caused by running of train. All materials expand when heated and contract when cooled.
Answered by
0
Answer: A. To allow for the metal tracks to expand on hot days.
Explanation: As because of heat tracks expand during summers .The gaps provide space for easy expansion of the rail which happens during summer as well as due to continuous fiction between the train wheels and the rails also Friction causes heat which can cause expansion .
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