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: Transverse Wave

  1. Sep 28, 2008 #1
    1. The problem statement, all variables and given/known data
    Algebra based physics: A 23 kg mass is suspended from the bottom of a rope of length 2.4 m and mass 17 kg. The acceleration of gravity is 9.8 m/s^2.
    Find time for a transverse wave to travel the length of the rope. Answer in units of sec.


    2. Relevant equations
    u= mass rope/ length rope
    F=mg
    v= d/t


    3. The attempt at a solution
    u= 17kg / 2.4m = 7.0833333

    v= sqr (17+23)(9.8)/7.0833333
    v= 7.439165039

    t= d/v
    t= 2.4m / 7.439165039
    t= 0.322616851 s

    This answer is wrong and i've had 2 tutors look over this but couldn't figure where the problem is.
     
  2. jcsd
  3. Sep 28, 2008 #2
    The mass of the rope is the medium the tension distributes across but it is not the source of the tension...although, if you want to be a bit more certain...you could use a bit of calculus to find the tension at various parts of the rope (it does change along its length...but you probably don't need to take this into account).
     
    Last edited: Sep 28, 2008
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook