User talk:86.38.202.83

The correct formula for MMOI of a thick cylinder has a + sign. Otherwise the MMOI of a thin ring would be 0 if the two radii are almost equal.

See: https://en.wikipedia.org/wiki/List_of_moments_of_inertia#cite_note-2

iou (talk) 16:34, 31 March 2018 (UTC)