Moment of inertia and Center of mass

daniel_i_l
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Lets say I have some convex shape defined by a set of points in a clockwise direction. How do I calculate the MOI and the COM?
 
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calculate the MOI.
first assume the coodinat of the axis is (x,y,z).and the distance from points to axis are known as ri.then the MOI =Σmiri^2 or ∫ρiri^2dl
do you think it is right?
 
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