# Finding angle of cable when pendulum is at its highest point

1. Jul 21, 2012

### kurispice

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.

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• ###### IMAG0353.jpg
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2. Jul 21, 2012

### rock.freak667

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.