One section of a steel railroad track is 25 meters long, if its temperature increases by 40 K during the day, how long does the track expand?

  1. One section of a steel railroad track is 25 meters long, if its temperature increases by 40 K during the day, how long does the track expand? The coefficient of linear thermal expansion of steel   12 106 per Kelvin

a. 12×10^6m

b. 12×10^4m

c. 12×10^3m

d. 1.2

2. Approximately how many moles of gas molecules are in the classroom

  1. 5×10^4moles
  2. 2×10^moles
  3. 9×10^3moles
  4. 1×10^3 moles 

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