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3 years ago

A railroad track has small gaps between sections of,metal rails . Why are those gaps needed?

2 answers:

7 0

Because all metal expands when heated. If two railway tracks were to be laid together without any gap they will push against each other when they expand in the day. (This is because of the heat of the sun.) When they cool down at night they will contract against each other and return to their original state pulling against each other. The constant pushing and pulling, due to the change of temperature, will cause the joints between the tracks to weaken. They may also break free from one another, causing derailments of trains, and loss of lives.

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Tom [10]3 years ago

4 0

The railway engineers always leave a small gap between two rails to compensate for the expansion of the rails

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2 years ago

(5372 + 100y^2) + 5(10y^2 – 110) Add the two polynomials and write in the form ay^2 + b, where a and b are constants, What is th

dangina [55]

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The value of a is 150 and b is 4822.

Explanation:

First, you have to expand to remove brackets :

$(5372 + 100 {y}^{2} ) + 5(10 {y}^{2} - 110)$

$= 5372 + 100 {y}^{2} + 50 {y}^{2} - 550$

Next, you have to simplify :

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$= 150 {y}^{2} + 4822$

Next, you have to compare it :

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$b = 4822$

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Read more on MACRA here: brainly.com/question/28045174

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2 years ago

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Paul [167]

The answer is B and C. Hope this helps!

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3 years ago

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