On a fairly cool rainy day when the temperature is 20^oC, the length of a steel railroad track is 20m. What will be its length on a hot a dry day when the temperature is 40^oC?
[coefficient of linear expansion of steel = 11 x 10^-6K^-1]

20.013m

20.009m

20.004m

20.002m

Correct answer is C

The increase in length of the steel rail is given by
= α 10
= 11 x 10^-6 x 20 x (40 -20)
= 11 x 10^-6 x 20 x 20
= 4.4 x 10^-3
∴ Final length will be original length plus increase in length
= 20 + 4.4 x 10^-3
= 20 + 0.0044
= 20.0044m

See all Physics questions & answers

See more JAMB questions & answers

On a fairly cool rainy day when the temperature is 20^oC, the length of a steel railroad track is 20m. What will be its length on a hot a dry day when the temperature is 40^oC?
[coefficient of linear expansion of steel = 11 x 10^-6K^-1]

Similar Questions

Aptitude Tests

On a fairly cool rainy day when the temperature is 20oC, the length of a steel railroad track is 20m. What will be its length on a hot a dry day when the temperature is 40oC? [coefficient of linear expansion of steel = 11 x 10-6K-1]

Similar Questions

Aptitude Tests

On a fairly cool rainy day when the temperature is 20^oC, the length of a steel railroad track is 20m. What will be its length on a hot a dry day when the temperature is 40^oC?
[coefficient of linear expansion of steel = 11 x 10^-6K^-1]