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thegaliscute
thegaliscute asked in Science & MathematicsPhysics · 3 years ago

how long is the rod? physics question?

A man strikes a long aluminum rod at one end. Another man, at the other end with his ear close to the rod, hears the sound of the blow twice (once through the air and once through the rod), with a 365.0 ms interval between them. How long is the rod? Take the speed of sound to be 343 m/s in air and 6420 m/s in aluminum.

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  • billrussell42
    Lv 7
    3 years ago

    Time to travel through the Al, t = d/v = x/6420

    time to travel through the air, t = x/343

    x/343 – x/6420 = 0.365

    29.155x – 1.558x = 3650

    27.596x = 3650

    x = 132.3 m

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