The factor of tension and frequency increase in a conical pendulum?

  1. This, is just a concept question:

    My teacher gave the Answer has something like this:

    However I understand most of it, except the part where it says:

    What is happening in this? Where does the 4*pi^2*L*sin(theta) come from, and how is v found? why is f = 1/t?
     
  2. jcsd
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