Centre of Gravity: Explaining Concepts & Examples

[bionut]

Hi, I am just wondering if someone can help explain a concept of CG:

I understand that in a homogeneous object the CG is in the geometric centre

In a object without a constant mass, the CG will be towards the end with the greater mass

But it say in my textbook that: "It is also possible for the CG to be located physically outside of the object."

But how does this occur? Could you mabey give an example of application??

Thanks

 

[lewando]

What would happen to the CG if you took a homogenous-density rod and bent it into a c-shape or circle?