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Homework Help: Centripetal Force Calc Question

  1. Apr 21, 2012 #1
    1. The problem statement, all variables and given/known data

    Calculate the centripetal force required to rotate a 3Kg object in a circle at a radius of 3m at one revolution per second?

    Ok for some reason i find circular motion a real struggle i have come up with an answer for this question but looking for some reassurance i am on the right lines.

    2. Relevant equations

    Fc = MV2/r

    V = 2[itex]\pi[/itex]r/t

    3. The attempt at a solution

    First i need to work out the velocity so i use V = 2[itex]\pi[/itex]r/t

    V = (2[itex]\pi[/itex] x 3)/1
    V = 18.85 m/s1

    With this i then used the Fc = MV2/r equation to work out the centripetal force as below.

    Fc = (3 x 18.852)/3
    Fc = 355.32 N

    As i said at the beginning of this post i lack confidence in circular motion so would appreciate a pointer in the right direction if i have gone astray.
  2. jcsd
  3. Apr 21, 2012 #2
    It's just fine.
  4. Apr 21, 2012 #3
    Thanks for the reassurance.
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