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September 20, 2014

Homework Help: Physics

Posted by Carden on Monday, March 29, 2010 at 9:46pm.

A 0.47 kg pendulum bob is attached to a string 1.2 m long. What is the change in the gravitational potential energy of the system as the bob swings from point A to point B where θ = 31?

I've tried using PE = mgh but I don't know where the 31 degrees comes in there. I'm confused as to what formula to use.

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