Have you ever listened for an approaching train by kneeling, Physics

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Have you ever listened for an approaching train by kneeling

Have you ever listened for an approaching train by kneeling next to a railroad track and putting your ear to the rail? Young's 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 30° C, how many times greater is the speed of sound in the rail than in the air? (Treat air as an ideal gas of particles with mass 4.78 10-26 kg and with ? = 1.40.)

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