4Centroids and Moments of Inertia
4.1 Centre of the Mass and Centroid
Consider the set of 
particles 
shown in Figure 4.1. For each particle 
one can define its position by the vector 
with respect to a chosen point 
.
The position vector 
(Figure 4.1) of the mass centre of the set of the particles 
, relative to the origin 
of the reference frame 
, is defined as
For the set of particles 
, the ...
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