What could be wrong with my approach to finding principal moments of inertia?

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SUMMARY

The discussion centers on the calculation of principal moments of inertia for a discrete set of mass points on a plane. The original poster expressed confusion over consistently obtaining a diagonal matrix for the inertia tensor when selecting a mass point as the origin. After community input, the poster resolved their misunderstanding, indicating that the approach was indeed correct. This highlights the importance of understanding the properties of inertia tensors in relation to mass point configurations.

PREREQUISITES
  • Understanding of inertia tensors in physics
  • Familiarity with diagonal matrices
  • Knowledge of mass point systems
  • Basic principles of mechanics
NEXT STEPS
  • Study the derivation of inertia tensors for various mass distributions
  • Learn about the significance of diagonal matrices in physics
  • Explore the concept of principal moments of inertia in three-dimensional systems
  • Investigate the impact of coordinate systems on inertia calculations
USEFUL FOR

Students in physics or engineering, particularly those studying mechanics and dynamics, as well as educators teaching concepts related to inertia and mass distributions.

Geocentric
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Homework Statement


I have a question on finding the principal moments of inertia of a discrete set of mass points on a plane. If I choose one of the mass points as the origin, I always end up having a diagonal matrix for the inertia tensor for any configuration. Isn't that weird? I sense something wrong with my solution. Could someone please help me?

Homework Equations


The Attempt at a Solution

 
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Never mind. I get it now guys.
 

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