Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Free fall with speed of sound

  1. Sep 19, 2010 #1


    User Avatar

    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

    User Avatar
    Science Advisor
    Homework Helper


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


    User Avatar

    I dont understand, what are you doing with the second equation?? can you go through the steps?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook