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!

Ξ cm = 4.9 sin (1.06 x - 0.77 t) - Determine Travelling Speed of Wave

  1. Jan 17, 2010 #1
    1. The problem statement, all variables and given/known data

    The equation of a wave along the x-axis is given as: ξ cm = 4.9 sin (1.06 x - 0.77 t)
    in which ξ is the displacement. Units on the right hand side are 1/cm for К and 1/s for ω.
    Determine the the traveling speed of the wave.
    Express the result in the unit m/s and to three significant figures. If you must use scientific notation, please enter as follows: e.g. 0.000123 = 1.23E-4. Only answer in numerical values, no units. For negative numbers, leave no space between the negative sign and the number: e.g. right: -1.00, wrong: - 1.00.

    2. Relevant equations

    I would think V= w/k

    3. The attempt at a solution

    V = 0.77/1.06
    = 0.726

    This is the wrong answer
  2. jcsd
  3. Jan 17, 2010 #2


    User Avatar
    Homework Helper

    lambda = 2*pi/1.06
    frequency f = 2*pi/077
    v = f*lambda.
    Try this one.
  4. Jan 18, 2010 #3
    v = 48.3

    It says it is wrong. Are the units m/s?
  5. Jan 18, 2010 #4


    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper
    Education Advisor

    Your initial method is correct. Try writing in the units to see what units your answer is in and then convert it if necessary.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook