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Homework Help: Free fall with speed of sound

  1. Sep 19, 2010 #1

    afa

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    1. The problem statement, all variables and given/known data

    A rock is dropped from a sea cliff, and the sound of it striking the ocean is heard 3.7s later. If the speed of sound is 340m.s how high is cliff?

    2. Relevant equations

    Ttotal=trock+tsound distance=Vsound*tsound ts=340m/s-trock x=x+vt+.5at^2 quadratic equation

    3. The attempt at a solution

    did each of these equations to get d=340m/s(3.7- 3.92) its wrong! PLEASE help :(
     
  2. jcsd
  3. Sep 19, 2010 #2

    Chi Meson

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    ts=d/340m/s

    initial v is zero (simplify)
    trock = SQRT (2d/g)
     
  4. Sep 19, 2010 #3

    afa

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    I dont understand, what are you doing with the second equation?? can you go through the steps?
     
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