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

Homework Help: Sound wave

  1. Nov 18, 2007 #1
    [SOLVED] Sound wave

    A stone is dropped from rest into a well. The sound of the splash is heard exactly 1.70 s later. Find the depth of the well if the air temperature is 12.0°C.


    Anything _s is the sound wave, anything _f is the stone falling
    I tried using these equations:


    v_s = 331(sqrt(285/273) = 338.2

    t_s = x/338.2
    1.7 = t_s + t_f
    x = .5(9.8)t_f^2

    I plugged the first equation into the second, solved the second for t_f and plugged that into the last one. Ends up being a nasty quadratic but I'm pretty sure my math is ok. I ended up with

    .000042841x^2 - .0492x + 14.161

    but that gives imaginary solutions. Thanks for the help.


    EDIT: Nevermind- I forgot to move the x over. Sorry!!!!!!!!!!!
     
    Last edited: Nov 18, 2007
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted