Question

Help with moment of inertia! (See attachment)

Answer 1

I need to find \(I_y\)
I calculated it but got it wrong..

Answer 2

Assume a=5.2 in

Answer 3

Hey CShrix :p

i am happy to scribble something out later, say 30mins, if that helps

willing to gamble at this stage, however, that it's a silly arithmetic or algebraic error

this is symmetric. and regular

Answer 4

Sure that sounds great! Thanks X)

Answer 5

for the semi circle, \(I_1 = \dfrac{\pi}{4}3^4 \times \dfrac{1}{2}\)

for the outer rectangle \(I_2 = \dfrac{6^3(5.2)}{12}\)

for the inner rectangle \(I_3 = \dfrac{2^3(5.2-2)}{12}\)

i ripped it from here:
https://en.wikipedia.org/wiki/List_of_area_moments_of_inertia#cite_note-1

if that does not help, pls advise :-)

Answer 6

Thanks! I'll see what this leads to. Dunno what I'm doing wrong

Answer 7

Got it! Really don't know what happened haha. Thanks! X)