1. ## Changing subject forumla

Hi i'm actaully at uni doing engineering i'm using this equation for trifilar suspension

T=2Pie*The Square Root of I*L Divided by M*rē*g

I need to change the Subject to Find I the mass moment of inertia

Any help would be great and sorry for not actualy using the right charaters.

2. Originally Posted by febbie22
Hi i'm actaully at uni doing engineering i'm using this equation for trifilar suspension

T=2Pie*The Square Root of I*L Divided by M*rē*g
$\displaystyle T = 2\pi\sqrt\frac{IL}{Mr^2g}$ $\displaystyle \Rightarrow \frac{T}{2\pi} = \sqrt\frac{IL}{Mr^2g}$ $\displaystyle \Rightarrow \left(\frac{T}{2\pi}\right)^2 = \left(\sqrt\frac{IL}{Mr^2g}\right)^2$ $\displaystyle \Rightarrow \frac{T^2}{4\pi^2} = \frac{IL}{Mr^2g}$ $\displaystyle \Rightarrow \frac{\left(T^2\right)\left(Mr^2g\right)}{4\pi^2} = IL$ $\displaystyle \Rightarrow \boxed{\frac{\left(T^2\right)\left(Mr^2g\right)}{\ left(4\pi^2\right)\left(L\right)} = I}$

Thanks alot

4. ## Re: Changing subject forumla

Hey, I know this was posted years ago, but ill post this for the sake of anyone else reading it now. I may be wrong, but shouldn't u end up with:

I = (T^2*Mr^2g)/(4pi^2*L) Should L not be on the bottom?