Quick Question a lá maths

anksta · 4 Feb 2008 at 18:32

2nd Moment of areas in shapes, I know for a rectangle its bh^3/12 but if its a thin walled shape, i.e. the area = area of outside rectangle - minus inside rectangle, is this the same for 2nd moment or do you have to do somethin else?

Does anyone know any websites where they have properties like this cos all I can find is strange obscure questions with an odd mention of somethin unrelated.

Cheers

West · 4 Feb 2008 at 18:58

Homework Questions arent allowed are they?

Amp34 · 4 Feb 2008 at 19:00

West said:
Homework Questions arent allowed are they?

You don't get homework at uni.

As for the OP's question, soz I can't help, it's been a while since I did maths to that level and i've forgotten.

Ben M · 4 Feb 2008 at 19:00

there's no accent needed on the "a" in "la"

oh, and do your own homework.

Carzy · 4 Feb 2008 at 19:26

Amp34 said:
You don't get homework at uni.

Yes you do.

Amp34 · 4 Feb 2008 at 19:27

Carzy said:
Yes you do.

No, you don't it's just called reading/work you should be doing anyway, with the emphasis on "should".

Squark · 4 Feb 2008 at 19:34

As far as I know, just deal with it as a rectangle, so long as thats what the general shape is,

Or, if you want to, four small rectangles.

Thinking about it, four rectangles is probably the way to go.