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## Homework Statement

## Homework Equations

i guess its r=sqrt(I/A)

where A is the area of the circle thing and I is the moment of intertia.

## The Attempt at a Solution

I guess I'm just having trouble getting I. A is 33pi

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- Thread starter SteelDirigibl
- Start date

- #1

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i guess its r=sqrt(I/A)

where A is the area of the circle thing and I is the moment of intertia.

I guess I'm just having trouble getting I. A is 33pi

- #2

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what have you tried?

- #3

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finding the centroid of the shape.

- #4

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- #5

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how do I find I_inner ?

- #6

ideasrule

Homework Helper

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- #7

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1/2*49pi*7^2 [I_outer] - (1/2*16pi*4^2+16*1)[I_inner]=3319

3319/(33pi)=32

sqrt(32)=5.66

And that was right...

thanks guys. I understand it a little better now..

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