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Homework Help: Finding angle of cable when pendulum is at its highest point

  1. Jul 21, 2012 #1
    1. The problem statement, all variables and given/known data

    Please see attached photo. It is problem 54.
    My difficulty is that I am not sure if I marked out the correct forces in the work-force equation. Without the height, I can't find the angle. I was going to use the formula: Δx=radius (times) Δθ
    However, I'm not even sure this is the right equation to use once I find the height. Should I use kinematic equations instead?

    2. Relevant equations

    Attached photo listing useful information for solving equation.

    3. The attempt at a solution

    Attached photo, written on notebook paper.

    Thanks for your help!

    Attached Files:

  2. jcsd
  3. Jul 21, 2012 #2


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    Homework Helper

    Draw a vertical line which and label it as the length of your pendulum string, and then draw the bob at the angle θ and then just draw a horizontal line through the bob when at the angle θ.

    You can use simple trigs to obtain the angle.
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