# Physics

posted by .

Steel railroad tracks of length L = 18.30 m are laid at 10.0° C. How much space should be left between the track sections if they are to just touch when the temperature is T = 49.0° C? mm

L° α Δt = 18.3 * 13 10^-6 * (49 -10) = .92781cm which equals to 9.2681 mm I think but its wrong. please help.

• Physics -

I have 12 * 10^-6 for the thermal expansion coef of steel
meters in --> meters out
18.3 * 12 * 10^-6 * (39) = 8564*10^-6 m
= .008564 m = 8.564 mm

• Physics -

Thank you so much Damon :)!

## Similar Questions

1. ### Physics

Suppose that a steel hoop could be constructed to fit just around the earth's equator at a temperature of 20.0 Celsius. What would be the thickness of space between the hoop and the earth if the temperature of the hoop were increased …
2. ### Physics

When railroad tracks are installed, gaps are left between the rails. Each steel rail is 8.0m long and has a cross-sectional area of 0.0020m^2. On a hot day, each rail thermally expands as much as 4.0mm. If there were no gaps between …
3. ### physical

Steel rails for a train track are laid in a region subject to extremes of temperature. The distance from one juncture to the next is 4.41 m, and the cross-sectional area of the rails is 60 cm2. If the rails touch each other without …
4. ### math

omar lays down straight tracks for his model railroad. each length of track is 8 inches long. which of the following could be the total length of omar's track?
5. ### physics

Ten meter long steel railroad rails are laid end to end, with no space between, on a hot day when the temperature is 115°F. Six months later the temperature has dropped to -2°F.How much space now exists between each rail?
6. ### physics

Ten meter long steel railroad rails are laid end to end, with no space between, on a hot day when the temperature is 115°F. Six months later the temperature has dropped to -2°F.How much space now exists between each rail?