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Physics

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The velocity of the transverse waves produced by an earthquake is 7.2 km/s, while that of the longitudinal waves is 4.2 km/s. A seismograph records the arrival of the transverse waves 68 s before that of the longitudinal waves. How far away was the earthquake?

  • Physics -

    Same distance D for both
    distance = speed * time
    D = 7.2 t
    D = 4.2(t+68)
    so
    7.2 t = 4.2(t+68) solve for t
    then use that t in D=7.2 t
    to get D, the distance

  • Physics -

    D = 685.44 km

    Thanks a lot!!

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