How would I solve this problem (center of mass)?

1. Nov 27, 2007

Three balls with masses of 5 g, 1 g, and 7 g,
respectively, are connected by massless rods.
The balls are located (in meter intervals) as
in the figure.

Imagine the first quadrant of a graph.
The 5 gram is at point (3,8)
The 7 gram is at point (5,2)
The 1 gram is at point (9,6)

What do do to find the center of gravity? I've looked online and I only see formulas for 2 objects instead of 3 so I'm stuck. Forgot to say they are all connected by massless rods.

Last edited: Nov 27, 2007
2. Nov 27, 2007

henry2221

the sum of the equations...

3. Nov 27, 2007

Sum of what equations?

4. Nov 27, 2007

henry2221

the sum of the center mass equation... and you gotta break it down into y and x... there is an similar example online, i'll look it up for you

5. Nov 27, 2007

henry2221

6. Nov 27, 2007