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Thread: rearranging equation

  1. Oct 10th 2008, 07:46 AM #1
    scarface1
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    rearranging equation

    hi how do I rearrange this equation to give me the value of J

    G= pi x D^2/ 4JL

    Thanks
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  2. Oct 10th 2008, 07:49 AM #2
    watchmath
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    Quote Originally Posted by scarface1 View Post
    hi how do I rearrange this equation to give me the value of J

    G= pi x D^2/ 4JL

    Thanks
    G= \pi \times D^2/ 4JL=\frac{\pi D^2}{4JL}

    Now multily both sides by 4JL and try to solv it for J
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  3. Oct 10th 2008, 07:57 AM #3
    scarface1
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    i dont quite understand which two sides im supposed to multiply :S
    could you possibly explain this step by step please

    Thank you so much
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  4. Oct 10th 2008, 08:47 AM #4
    jpatrie
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    If i'm reading the question correctly, it's G=\frac{\pi(D^2)}{4JL}

    So;

    \pi(D^2)=4GJL

    \frac{\pi(D^2)}{4GL}=J
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  5. Oct 10th 2008, 08:48 AM #5
    jpatrie
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    You would cross multiply and solve for J
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