1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Waves velocity

  1. Mar 3, 2009 #1
    1. The problem statement, all variables and given/known data

    the question is:the floats of 2 men fishing in a lake from boats is 21m apart.the waves causes both boats to bob up-down 20 times/minute.A third man observes that one of his colleagues is on the crest while other is on trough,and there is a one crest distance between them?find velocity

    2. Relevant equations

    v=f(lambda)

    3. The attempt at a solution
    idk but would f=20 and lambda=which i cant figure out1/4 or something
    help pls
    =(
     
  2. jcsd
  3. Mar 3, 2009 #2

    Delphi51

    User Avatar
    Homework Helper

    In order to use your v = f*lambda formula you need to know the wavelength, and it is not at all clear from the wording of the question. It looks like the wording has been messed up - can you check and make sure it is copied word for word? In particular, I don't understand "one crest distance" and are they saying the boats are 21 m apart or the floats are 21 m apart?
     
  4. Mar 3, 2009 #3
    k here is the actual question format:The floats of two men fishing in a lake from boats are 21m apart.The waves causes boats to bob up and down 20 times per minute.A man in a third boat observes that when the boat of one of his colleagues is on the crest of a wave,that of the other is in a trough,and that there is one crest between them.what is Velocity.
     
  5. Mar 3, 2009 #4

    Delphi51

    User Avatar
    Homework Helper

    Much better! The boats are 21 m apart and they are 1.5 wavelengths apart. From that you can calculate the wavelength. Careful with the units - remember the frequency is per MINUTE.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Waves velocity
  1. Wave velocity (Replies: 4)

  2. Velocity of a wave (Replies: 0)

  3. Velocity of wave (Replies: 1)

  4. Velocity of a Wave (Replies: 2)

Loading...