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: Help on question,

  1. Apr 28, 2005 #1
    Help on question, plzzzzzzz

    Hi, iv been struggling with this question for some time now, so i thought if some1 can help on the follwoing quiestion:

    Q) A lightly damped system vibrates with a period of 15.0s. In half a minute its amplitude decreases from 50cm to 5.00mm. What would be the period if the damping force were removed?

    Thank you if u answer this question. :::ADY::: :smile: :smile: :smile:
     
  2. jcsd
  3. Apr 28, 2005 #2

    OlderDan

    User Avatar
    Science Advisor
    Homework Helper

    It takes a bit of work to find their definition of [itex]\omega_0[/itex] here, but this explains the frequency dependence on the damping term of an oscillator. [itex]\omega_0[/itex] is the frequency when no damping is present.

    http://hyperphysics.phy-astr.gsu.edu/hbase/oscda.html
     
  4. Apr 30, 2005 #3
    There is a fuction describing this.
    As far as I can remember,it is A=A(max)*e^(-wt)*cos(wt+.....)
    Since you know that "In half a minute its amplitude decreases from 50cm to 5.00mm." you can find how much is that "w".But I am not very sure,may I can tell you the accurate one if you contact me at wangkehandsome@hotmail.com later.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook