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Simple Harmonic Motion and equilibrium of springs

  1. Jun 9, 2017 #1
    The figure below shows a system in equillibrium. The pulley and the springs (both with constants "k") are ideal. The period of oscillation of the mass A is given by:

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    SE8FBui.png
    [​IMG]

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    Relevant equations:

    F = -kx (SHM)

    I tried to do a "force diagram" and set up some geometric relations but it´s not working.
     
  2. jcsd
  3. Jun 9, 2017 #2

    BvU

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    Hi,

    You can start with discarding the answers that have the wrong dimension.
    Your relevant equation needs a few colleagues: at least one with a dimension of time.
    Would you know how the period for a simple mass hanging from a spring comes about ?
    What is the restoring force for a disturbance from equilibrium in your system ?

    Oh, and I notice you haven't been welcomed, so here goes:
    Hello Mateus, :welcome: !
     
  4. Jun 9, 2017 #3

    gneill

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    Please show the details of what you have tried.
     
  5. Jun 9, 2017 #4
    Thank you but no answer has a wrong dimension, cause they are all in the form of a constant*root(m/k), which is correct!
     
  6. Jun 9, 2017 #5

    BvU

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    Oops, so that doesn't help. Now how about the 'combined' spring constant ? What is the restoring force if I pull down the mass over a small distance ##x## ?
     
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