How to measure moment of inertia for multiple components in a single assembly?

[aa22adz]

I'm looking for the moment of inertia for a trebuchet arm I designed. Each time I try to select more than one component in the assembly, the properties menu chooses only one to display the information about. I can't just combine the parts because it's multiple materials. 

[jhackney1972]

Make sure you are using Components and join them together in an assembly.  Then you can right click on the top level assembly and click on Properties to get your combined Moment of Inertia.

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