I found places that say it's the same as a cylinder and some that say it's (1/2)MR^2.
Which is it?
Which is it?
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Both. The moment of inertia of a (solid, uniform) cylinder is also ½MR².
Kinda makes sense, because a disk is really just a short, fat cylinder anyway.
Kinda makes sense, because a disk is really just a short, fat cylinder anyway.