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## Homework Statement

I'm confused about how to find the center of mass

http://www.screencast.com/users/ntrinh3/folders/Jing/media/a9773d23-38f1-4d28-a6f8-3b681d42d4c2

and

http://www.screencast.com/users/ntrinh3/folders/Jing/media/bfb40c40-0068-41e8-ac83-2146e1df3330

## Homework Equations

So the equation my professor gives Cm=sum of MR/sum of masses

## The Attempt at a Solution

Where exactly is this R reference point?