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What is the acceleration of the object?

  1. Sep 26, 2013 #1
    1. The problem statement, all variables and given/known data

    Consider a 3 kg object moving in a 2.5 m radius circle at 5.7 m/s to answer the next 2 questions.

    4. How much force is required to keep the object moving in the circle?
    1.3 N
    3.3 N
    39 N
    6.8 N

    5. What is the acceleration of the object?
    13 m/s2
    39 m/s2
    6.8 m/s2
    2.3 m/s2

    2. Relevant equations

    For the first one:
    a=(v^2)/r = (5.7^2)/2.5 = 12.9996

    thus, F=3*12.9996 = 38.988N

    3. The attempt at a solution
    I think I got the first one. Is that one the right answer? I can't figure out the second one though. Thanks for your help!
  2. jcsd
  3. Sep 26, 2013 #2
    You cannot figure out acceleration? What is 'a' then?
  4. Sep 26, 2013 #3
    Actually I think you have already got it. Just round your answer off.
    (And some vector signs won't hurt...)
  5. Sep 26, 2013 #4
    Oh my gosh you're right. I did too much work lol. Thanks!!!!
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