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Circular motion problem

  1. Nov 4, 2013 #1
    1. The problem statement, all variables and given/known data

    An athlete whirls a 7.00 kg hammer tied to the end of a 1.3 m chain in horizontal chain. The hammer makes one complete revolution in 1.0 s.
    (A) What is the centripetal acceleration of the hammer? 51 m/s2



    2. Relevant equations
    ac=4pi^2*r/r^2


    3. The attempt at a solution
    I know the formula for centripetal acceleration is as above. but how is the answer 51?
    I put it in my calculator and did not get that...
    4(3.14^2)(1.3)/1.3^2)

    What am i doing wrong??
     
  2. jcsd
  3. Nov 4, 2013 #2

    tiny-tim

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