How Do You Calculate the Center of Mass for Irregular Objects?

[kthejohnster]

Homework Statement

find center of mass

Homework Equations

(r1m1+r2m2+...)/m1+m2+...

The Attempt at a Solution

cut into two pieces with one center at 2,5 and one 3,2. used each square on grid as one unit is that okay?

 

[LawrenceC]

Using the rectangles of the grid as one unit is ok. The y-axis coordinate is a little confusing.