Solved: Have you ever listened for an approaching train by
Chapter 16, Problem 16.87(choose chapter or problem)
Have you ever listened for an approaching train by kneeling next to a railroad track and putting your ear to the rail? Youngs modulus for steel is Y 2.0 1011 N/m2 , and the density of steel is 7860 kg/m3 . On a day when the temperature is 20 C, how many times greater is the speed of sound in the rail than in the air? 35
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