Answer:
The carrier lengthen is 0.08436 m.
Step-by-step explanation:
Given that,
Length = 370 m
Initial temperature = 2.0°C
Final temperature = 21°C
We need to calculate the change temperature
Using formula of change of temperature
![\Delta T=T_(f)-T_(i)](https://img.qammunity.org/2020/formulas/physics/college/uz359axicsf7hazw2lugibe2o1p31xpr0w.png)
![\Delta T=21-2.0](https://img.qammunity.org/2020/formulas/physics/high-school/o3bfeauacbvxerzrgvuus2y5umbblxx7le.png)
![\Delta T=19^(\circ)C](https://img.qammunity.org/2020/formulas/physics/high-school/eyikip6dgg5rnyyy8kiaimgu2bdphw4hak.png)
We need to calculate the carrier lengthen
Using formula of length
![\Delta L=\alpha_(steel)* L_(0)*\Delta T](https://img.qammunity.org/2020/formulas/physics/high-school/scgvblltqxsgpkdhpulb7fcbcn2e4ty9ey.png)
Put the value into the formula
![\Delta L=1.2*10^(-5)*370*19](https://img.qammunity.org/2020/formulas/physics/high-school/mjsq6eadoily2qa7qfmjik6v5ayy8phfiy.png)
![\Delta L=0.08436\ m](https://img.qammunity.org/2020/formulas/physics/high-school/ewcvgjmjvbk0advtdu3m3j09d0llhh33xq.png)
Hence, The carrier lengthen is 0.08436 m.