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Subtracting object MOI from assembly to get other parts MOI?

  • #1
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Homework Statement


It's been ages since I have done Moments of Inertia of complex objects!! :( Can anyone help??
Say you have an assembly like an airplane and you want to just get the moment of inertia(MOI) of the tail section and you are given the Mass of whole plane,mass of tail section, moment of inertia of front section, and moment of whole plane(moments about each axis for both). Can you just subtract the MOIs of known sections to get the MOI of unknown sections? If not, how would you go about getting the unknown sections MOI from that info.

Homework Equations




The Attempt at a Solution

 

Answers and Replies

  • #2
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You must show us your attempt at the solution before we are allowed to help.
 
Last edited:
  • #3
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Oh. Sorry I posted this question in wrong area. I don’t have a specific problem but wanted to know for future problems on exams and real world applications.
 

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