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Homework Help: Radial acceleration of a discus

  1. Aug 22, 2007 #1
    This may seem like a silly way to second-guess an answer, but the problem below seems to have an answer entirely too easy to obtain. o_O And I doubt that I'm getting any better.

    An athlete rotates a 1.00-kg discus along a circular path of radius 1.06m. The maximum speed of the discus is 20.0m/s. Determine the magnitude of the maximum radial acceleration of the discus.

    ar = -ac = -(v^2/r)
    = -(20^2/1.06)
    = -377.358 m/s^2
  2. jcsd
  3. Aug 22, 2007 #2

    Doc Al

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    Staff: Mentor

    The problem is as easy as it seems. (Maybe you're getting better despite yourself. :smile: ) Your answer is correct--except for the minus sign and carrying too many significant figures.
  4. Aug 22, 2007 #3
    Ah, yes, I know about the extensive amount of decimal points, but I round at the end. XDDD

    And, well, stupid mistake. XD I put parantheses around the fraction and then put the negative sign in my notes, but I checked back in my textbook after your reply and fixed it.


    Thank you!
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