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|dw:1350922648157:dw|

|dw:1350922771112:dw||dw:1350922889055:dw|

r(lambda) d(theta)?

|dw:1350923517490:dw|

R^3 (lambda) d(theta)?

You mean....?

|dw:1350923841372:dw|

whole ring?
length = r theta
I = r^3 theta (lambda)

no ... this varies with theta ... so we integrate it along 0 to 2 Pi

|dw:1350924064331:dw|

I think I got it..

so what is the final answer?

(lamda) R^3 (2 pi)

yep .. what would (lamda) (2 pi) R = ??

M?

yeah the moment of Inertia of ring is MR^2

|dw:1350924842776:dw|

|dw:1350924935079:dw|

Wait, surface / unit area? What's that?

sorry ... mass per unit area ... typo.

|dw:1350925702449:dw|