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Different Tensions Acting on a Weight

  1. Nov 1, 2012 #1
    1. The problem statement, all variables and given/known data

    A 1 kg mass is hanging from a weightless string and is pulled by another weightless string to an angle of θ from the vertical. The string pulling on the weight is exactly perpendicular to Fg. When the horizontal string is cut, the weight swings 2θ. What is the tension (T1) in the string before the horizontal string is cut, and what is the tension (T2) in the string when the weight swings to 2θ?

    2. Relevant equations

    T1 = FgTanθ, T2 = Fg/cosθ

    3. The attempt at a solution

    T2 = 9.81N/cosθ
    T1 = T2sinθ
     
  2. jcsd
  3. Nov 1, 2012 #2

    haruspex

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    I don't think either of the equations is correct.
    What are all the forces and accelerations in the two cases?
    Which way will you resolve them to extract the equations?
     
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