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You strike the end of a metal bar that is 5 m long, simultaneously starting an...

You strike the end of a metal bar that is 5 m long, simultaneously starting an electronic timer, which is then stopped when a microphone at the other end of the bar first detects a sound. The measured time for sound to go from one end of the bar to the other is 0.3 ms, and the density of the bar is measured to be 7 g/cm3. What is Young's modulus for this material?

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