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CG calculation

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If I have a body with mass m1, bolted to a body with mass m2, how do I find the CG of the entire system?
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HallsofIvy
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Find the CG of each separately, Then find the "weighted" average with each weighted by its mass. That is, using x to mean "x-coordinate". CGx= (m1CG1x+ m2CG2x)/(m1+ m2). The same is true for the y and z components.
 

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