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Oscillation problem

  1. Sep 18, 2007 #1
    1. The problem statement, all variables and given/known data

    A spring (which tension is k) is connected with a body (which mass is m). The whole system is in viscous liquid. In this liquid frictional force is proportional to speed: F = -C*v. With what C value the oscillation won't happen?

    3. The attempt at a solution

    The damping ratio is defined as dr = c / (2 * sqrt(k * m)). No oscilation will happen when there is critical damping dr = 1 or when there is overdamping dr > 1.

    So: C >= sqrt(4mk);

    Is the solution above right?
  2. jcsd
  3. Sep 18, 2007 #2
    The reasoning is correct, but I haven't checked your formulae.
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