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Thread: need a math expert

  1. May 17th, 2001, 04:23 PM #1
    windowsexpert
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    need a math expert

    hello, i have a math question for you.
    If i have a wheel 2" in diameter, and it makes 1 revolution per minute. How many miles per hour is it going? i should really know this one.

    thanx for your help.
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  2. May 17th, 2001, 04:29 PM #2
    chrisjk
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    2Pr is the key to this one. Circumference of wheel is 2*3.1415*2 = 12.566 inches. So it moves 12.566 inches in 1 revolution, which takes 1 minute

    Then change the units into mph and you're there
    Last edited by chrisjk; May 17th, 2001 at 04:32 PM.
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  3. May 17th, 2001, 04:30 PM #3
    parksie
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    How big is 2"?
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  4. May 17th, 2001, 04:33 PM #4
    chrisjk
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    2" = 2 inches
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  6. May 17th, 2001, 04:35 PM #5
    parksie
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    Thanks

    Remember speed = distance / time
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  7. May 17th, 2001, 04:36 PM #6
    SurfDemon
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    Originally posted by chrisjk
    2Pr is the key to this one. Circumference of wheel is 2*3.1415*2 = 12.566 inches. So it moves 12.566 inches in 1 revolution, which takes 1 minute

    Then change the units into mph and you're there
    Er... I'm not trying to be picky, but the diameter of the wheel is 2" therefore the radius is 1" therefore it's 2*3.14159 = 6.28318 inches per minute.

    SD
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  8. May 17th, 2001, 04:37 PM #7
    SurfDemon
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    So all we need to know now is how many feet or inches in a mile.

    Anyone know?

    SD
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  9. May 17th, 2001, 04:38 PM #8
    parksie
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    True.
    I refuse to tie my hands behind my back and hear somebody say "Bend Over, Boy, Because You Have It Coming To You".
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  11. May 17th, 2001, 04:38 PM #9
    chrisjk
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    yeah yeah SD, that's why I didn't do Maths Degree!!!

    Cheeky sod
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  12. May 17th, 2001, 04:41 PM #10
    chrisjk
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    Originally posted by SurfDemon
    So all we need to know now is how many feet or inches in a mile.

    Anyone know?SD
    Well 1 mile/minute is 63359.873279999985 inches/minute
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  13. May 17th, 2001, 04:41 PM #11
    SurfDemon
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    Mmmm, Chris so using your maths how many inches have you been telling the girls, 'cause I think you might need to half it

    SD
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  14. May 17th, 2001, 04:42 PM #12
    chrisjk
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    Luckily I've been saying 14". Phew!
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  15. May 17th, 2001, 04:44 PM #13
    parksie
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    Phew!
    Probably what they said as well!
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  16. May 17th, 2001, 04:44 PM #14
    SurfDemon
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    "I'd rather have a full bottle in front of me than a full frontal lobotomy!"
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