Rotational Inertia of Solid Disk

  • #1

Homework Statement



What is the rotational inertia of a solid iron disk of mass 46 kg, with a thickness of 6.31 cm and radius of 19.4 cm, about an axis through its center and perpendicular to it?

Homework Equations



either 1/2MR^(2) or I = sigma (1->N) Mi x Ri^(2)

The Attempt at a Solution


I don't know what to do!!!
 

Answers and Replies

  • #2
tiny-tim
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Welcome to PF!

What is the rotational inertia of a solid iron disk of mass 46 kg, with a thickness of 6.31 cm and radius of 19.4 cm, about an axis through its center and perpendicular to it?

Hi Kickbladesama! Welcome to PF! :smile:

Hint: divide the disc into concentric slices of thickness dr, and integrate. :wink:
 

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