Inertia Tensors for Fractional Volumes: How to Calculate?

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SUMMARY

The discussion focuses on calculating the inertia tensor for fractional volumes, specifically for shapes such as half of a sphere, half of a cylinder, and quarter of a disk. The key point is to take the mass (M) as a fraction of the total mass of the volume rather than using the entire volume's mass. Participants emphasize the need for a clear understanding of the inertia tensor for complete volumes before tackling fractional cases.

PREREQUISITES
  • Understanding of inertia tensors for solid shapes
  • Familiarity with basic calculus and integration techniques
  • Knowledge of geometric properties of spheres, cylinders, and disks
  • Experience with mass distribution concepts in physics
NEXT STEPS
  • Study the derivation of inertia tensors for complete volumes
  • Learn about the parallel axis theorem and its applications
  • Explore integration techniques for calculating mass distributions
  • Investigate specific examples of fractional volume inertia tensors
USEFUL FOR

Students in physics or engineering fields, educators teaching mechanics, and professionals involved in structural analysis or robotics who require a solid grasp of inertia tensors for various shapes.

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Homework Statement


How do you find the tensor of inertia for fractions of the usual volumes?
(like half of a sphere, half of a cylinder, half of a disk, quarter of a disk, etc.)

I already know the tensor of inertia for the whole volume.
Take M as the fraction of the volume's mass, not the whole volume's.

Homework Equations



The Attempt at a Solution


I have no idea where to start...

Thanks.
 
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