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Circumference of cirlce

  1. Oct 16, 2007 #1
    1. The problem statement, all variables and given/known data
    i know Circumference is C = pi . d
    if i have a wheel that need to be rotate in given time, how much centimeter i need to rotate in 1 sec?..

    2. Relevant equations
    if i have this :
    Diameter = 5cm
    Circumference = 15.7cm
    Given time = 60sec

    3. The attempt at a solution
    and i got the calculation..dunno if this right/wrong..thats y i need ur help guys..=.='

    Given_Times / Circumference

    Answer : 3.8217 cm / sec

    */ sorry for my bad english /*
     
    Last edited: Oct 16, 2007
  2. jcsd
  3. Oct 16, 2007 #2

    Dick

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    Don't you want circumference/time?
     
  4. Oct 17, 2007 #3

    HallsofIvy

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    No, he doesn't because that would have units of "time/distance". He asked "how much centimeter i need to rotate in 1 sec?" which has units of "distance/time": cm/sec.

    Soharu: Yes, the circumference, in cm., divided by the time, in seconds, of one rotation will give you the speed, at the circumference, in cm/sec.
     
  5. Oct 17, 2007 #4

    Dick

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    Why do you say "circumference/time" would have units of "time/distance"?
     
  6. Oct 17, 2007 #5
    if its circumference over time then its 15.707/60 which gives .26178 cm/sec.
     
  7. Oct 18, 2007 #6
    thanx guys..now i got the result...my bad..my bad..it's cm/sec.
    so the answer i got is same with the quote above..15.7/60 =
    0.26718 cm/sec
     
  8. Oct 18, 2007 #7

    HallsofIvy

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    Because I just plain misread what you wrote, of course!
     
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