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Moment of inertia of a disk

  • Thread starter deezy
  • Start date
  • #1
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Homework Statement


What is the moment of inertia of an 8 kg, 40 cm diameter disk for rotation through the edge of the disk?


Homework Equations


[tex]I = \frac{1}{2}MR^2[/tex]


The Attempt at a Solution



Inertia at the center of the disk would be [tex]I = \frac{1}{2}MR^2[/tex], right? I'm not sure what the right equation for inertia at a point on the edge of a disk would be.
 

Answers and Replies

  • #2
Andrew Mason
Science Advisor
Homework Helper
7,560
323
Apply the parallel axis theorem to find the moment of inertia about a parallel axis a distance d from the centre of mass:

[tex]I = I_{cm} + Md^2[/tex]


AM
 

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