- #1
QD311
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Homework Statement
I'm trying to understand the equations given in my textbook (Principles of Physics, Ninth International Edition) for finding the center of mass. The equations are given below. They're used to find the x, y, and z components of the center of mass for objects. I'm trying to interpret them in the framework of a problem given to us, where we had to calculate the moment of inertia of a rod of mass M, with a solid sphere of mass 2M attached at the end, with the axis of rotation through the center of the rod and sphere (a rough approximation of a baseball bat).
Homework Equations
[tex]{ x }_{ com }=\frac { 1 }{ M } \int { x\quad dm } ,\quad y_{ com }=\frac { 1 }{ M } \int { y\quad dm } ,\quad { z }_{ com }=\frac { 1 }{ M } \int { z\quad dm }[/tex]
The Attempt at a Solution
The problem is, that I have no idea what to put in for the 'x', 'y' and 'z' variables in the integral equations.