# Finding center of mass

1. Nov 24, 2009

### xxlvh

1. The density of part A (p)(kg/m^3) and in part B (p/2)(kg/m^3). Find the coordinate (x,y) of the center of mass of this object.

(consider a piece of the object that is one meter in the z direction)

2. R = sum(m*r) / sum(m)...maybe?

I am completely stumped on how to start this problem my teacher has done no sample problems that are anything like this, not even anything in 3D, if anyone could at least provide a hint to get me started on this one? Would be greatly appreciated.

Last edited: Nov 24, 2009
2. Nov 24, 2009

### LCKurtz

This isn't a 3d problem, it's a 2d problem and he only wants $(\overline x,\overline y)$ Break it up into three rectangles, find the mass and center of mass of each. Then find the center of mass of the three masses as if they were point masses at their centers of mass.

3. Nov 24, 2009

### xxlvh

Awesome, thanks a ton for helping me get started!!