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  1. #1
    Senior Member Bradley's Avatar
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    Math help for a DIY project

    I need to figure out a length of a cylinder
    I know the volume (800ci) and the radius, (1.5")
    I need to know the height/length
    If:
    V=3.14 x r2 x h
    800ci = 3.14 x 2.25 x h
    800 = 7.065 x h
    or 800/7.065 = h
    h = 113.23"

    ? ? ?

    Thanks eh
    Last edited by Bradley; 06-15-2011 at 07:12.
    Bradley SaintJohn
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  2. #2
    Senior Member Eliteoomph's Avatar
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    37.72562 ft
    that sound right?

  3. #3
    GrizzlyAdams's Avatar
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    Quote Originally Posted by Bradley View Post
    I need to figure out a length of a cylinder
    I know the volume (800ci) and the radius, (1.5")
    I need to know the height/length
    If:
    V=3.14 x r2 x h
    800ci = 3.14 x 2.25 x h
    800 = 7.065 x h
    or 800/7.065 = h
    h = 113.23"

    ? ? ?

    Thanks eh
    Checks out to me. if you use PI to a few more digits you get h=113.17" But maybe Pi = 3.14 in Canada....
    Grizz
    (alias ProfessorHammock on youtube)

  4. #4
    Senior Member Eliteoomph's Avatar
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    no no 9.41 ft... about 113 inches long

  5. #5
    Senior Member Eliteoomph's Avatar
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    yeah that's right... i messed up in my first one ;o) but i quickly saw my mistake

  6. #6
    Ramblinrev's Avatar
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    Quote Originally Posted by Bradley View Post
    I need to figure out a length of a cylinder
    I know the volume (800ci) and the radius, (1.5")
    I need to know the height/length
    If:
    V=3.14 x r2 x h
    800ci = 3.14 x 2.25 x h
    800 = 7.065 x h
    or 800/7.065 = h
    h = 113.23"

    ? ? ?

    Thanks eh
    I'm no math scholar

    Edited to let that statement stand by itself as ontological proof of it's truth.
    Last edited by Ramblinrev; 06-15-2011 at 06:46.
    I may be slow... But I sure am gimpy.

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  7. #7
    Senior Member ShadowAlpha's Avatar
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    DTY?

    lengthen your message to at least 10 characters.

  8. #8
    Senior Member XexorZ's Avatar
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    113.177 Inches

    Pi * r ^ 2 * h = v

    Pi * 1.5 ^2 * h = 800

    h = v / ( Pi * r ^2 )

    h = 800 / (Pi * 1.5 ^2)

    h = 800 / 7.06858

    h = 113.177

    ( really roughly: )
    h = ~ 113 3/16
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  9. #9
    Dutch's Avatar
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    I think it is a little more than 113, but I didn't use math. It came to me in a premonition.
    .
    Peace Dutch
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  10. #10
    in it for the naps oldgringo's Avatar
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    What is this "math" you speak of??????
    Dave

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