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Math Help - Changing subject forumla

  1. #1
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    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.
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  2. #2
    Newbie I4talent's Avatar
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    Quote Originally Posted by febbie22 View Post
    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
    T = 2\pi\sqrt\frac{IL}{Mr^2g} \Rightarrow \frac{T}{2\pi} = \sqrt\frac{IL}{Mr^2g} \Rightarrow \left(\frac{T}{2\pi}\right)^2 = \left(\sqrt\frac{IL}{Mr^2g}\right)^2 \Rightarrow \frac{T^2}{4\pi^2} = \frac{IL}{Mr^2g} \Rightarrow \frac{\left(T^2\right)\left(Mr^2g\right)}{4\pi^2} = IL  \Rightarrow \boxed{\frac{\left(T^2\right)\left(Mr^2g\right)}{\  left(4\pi^2\right)\left(L\right)} = I}
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  3. #3
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    Cheers

    Thanks alot
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  4. #4
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    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?
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