1. Limited time only! Sign up for a free 30min personal 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!

Homework Help: Trying to cancel units out for velocity of transverse wave

  1. May 21, 2014 #1
    Not a specific question, but I just need help understanding how units cancel out.

    v = sqrt(force of tension / mass density)

    Force of tension is in Newtons. Mass density is in kg/m^3

    Nt/ (kg/m^3) = (kg*m/s^2)/(kg/m^3) =(I cross multiply here) (kg*m*m^3)/(s^2*kg)

    kg cancels out. Remember it is the sqrt of it all.

    sqrt(m^4/s^2) = m^2/s

    This does not equal m/s. Is there something I am missing?
  2. jcsd
  3. May 21, 2014 #2

    Doc Al

    User Avatar

    Staff: Mentor

    The mass density needed here is linear mass density: mass per unit length.
  4. May 21, 2014 #3
    Ah thanks. Then this must mean the linear mass density is equal to the mass density times its cross-sectional area. This clears up lots of confusion!
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted