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Forced oscillations

  1. Jan 12, 2009 #1
    A mass spring system with natural frequency of 1.5Hz is set up as shown:

    [​IMG]

    Can someone please explain the reasons for the following observations:

    When the support rod oscillates at a frequency of 0.2 Hz - oscillations are (almost) in phase with driver

    When the support rod oscillates at a frequency of 1.5 Hz - oscillations have a phase difference is pi/2 radians with the driver.

    When the support rod oscillates at a frequency of 10 Hz - oscillations are out of phase with driver [or phase lag of (almost) pi on driver]

    Thanks
     
  2. jcsd
  3. Jan 13, 2009 #2
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