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Homework Help: Angular velocity in a uniform circular motion.

  1. Jan 21, 2010 #1
    Hi people, i had my final exam yesterday, and one of the questions was this "a particle in uniform circular motion, moved for an interval of 0.185 seconds in a circular path of radius 16 cm, what is the angular velocity of the particle"???

    I think that the question lacks information, am i right???

    We all know that "s = rϑ", and that "v = s/t", "v = rω", I made the substitutions needed, but came with the result that there's a lack of information, so please people, help is needed.
    Last edited: Jan 21, 2010
  2. jcsd
  3. Jan 21, 2010 #2


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    Welcome to PF!

    Hi tete9000! Welcome to PF! :smile:
    I agree, that's very badly worded.

    (was it in English, or is that a translation?)

    If I was taking the exam, I would assume that the question meant that "in a circle" meant a complete circle; alternatively, that "period" was being used in its technical sense rather than its general sense, as if it had said "with a period" (and so again meant the time to make a complete circle).

    But that's not what the question says. :frown:
  4. Jan 21, 2010 #3
    Re: Welcome to PF!

    Sorry tiny-tim, i edited the question concerning the points you mentioned, but you agree that there's a lack of information relating the question, right???
  5. Jan 22, 2010 #4


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    Hi tete9000! :smile:

    (just got up :zzz: … )

    (I'd still assume it meant a complete circle, but on the new wording, that's just a wild guess :redface:)
  6. Jan 22, 2010 #5
    There must be something lacking. If it had said "the particle completed a full circle at t=0.185, taking into account that the motion started at t=0", then nothing would have sounded defective.

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