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Math Help - [SOLVED] Please help solve for d

  1. #1
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    [SOLVED] Please help solve for d

    can someone plese solve for d, then just write the steps taken,
    Thanks.
    I got 67mm but its not right, should be about 48mm

    360E^3=[(π^2207E^9((πd^2)/4))/(1.2/(d/4))^2 ]

    sorry cant figure out how to write in eqn properly.

    360e^3= [(pie^2*207e^9*((pie*d^2)/4)) / ((1.2/(d/4))^2] does that make sense?
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  2. #2
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    Hi psupernak

    You can learn to type equation here : http://www.mathhelpforum.com/math-he...-tutorial.html

    Is your question :

    360e^3=\pi^2 207e^9\left(\frac{\frac{\pi d^2}{4}}{\frac{1.2}{\frac{d}{4}}}\right)^2

    Btw, it's pi not pie
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  3. #3
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    close, the big brackets and sq. belong to only the 1.2/xxx. so ((1.2/(d/4))^2
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  4. #4
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    [IMG]file:///C:/Users/Peter/AppData/Local/Temp/moz-screenshot.jpg[/IMG][IMG]file:///C:/Users/Peter/AppData/Local/Temp/moz-screenshot-1.jpg[/IMG] 360*10^3= [(pi^2*207*10^9*((pi*d^2)/4))]/[(1.2/(d/4))]^2
    Last edited by psupernak; September 13th 2009 at 11:12 PM.
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  5. #5
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    tried but still didnt work. Also, along with the brackets in wrong spot, the (1.2/(d/4))^2 is under all of RHS
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  6. #6
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    Hi psupernak

    360e^3=\pi^2 207e^9 \frac{\frac{\pi d^2}{4}}{\left(\frac{1.2}{\frac{d}{4}}\right)^2} ?
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  7. #7
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    correct!, what am i doing wrong when i try to type it.
    Can you please solve and write a quick step by step procedure,
    Cheers
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  8. #8
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    Hi psupernak

    Use \frac{smoething}{something} to write fraction.

    How about you write what you've tried then maybe someone can check it for you
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  9. #9
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    ill just say what i did, icant igure out the eqn editor.

    basically i brought the 4 next to the 1.2, then squared both these. while still above d^2. Then i made the pi^2*207E9*pi*d^2 /4, making, [(pi^3*207E9/4)*.25] * d^2.

    Then brought the bottom d^2 up, which made it a d^4. Then had the [(pi^3*207E9/4)*.25] over 23.04 ,which was from (1.2*4)^2

    Then had 360E3 * 23.04, then divided LHS by number next to d^4. The 4 rooted answer.

    And got 67E-3, which is 67mm.

    Can you please solve!?!
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  10. #10
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    Hi psupernak

    From where did you get 0.25 in (pi^3*207 e^9/4)*.25 ?
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  11. #11
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    cos it was all that *d/4, which = all that * 1/4 times d.
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  12. #12
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    Hi psupernak

    There are two 4's. One you use in (pi^3*207 e^9/4) and one you use in "[(pi^3*207E9/4)*.25] over 23.04 ,which was from (1.2*4)^2"
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  13. #13
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    its ok, i solved it. Thanks
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