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Dynamic calculation problem

  1. Sep 29, 2009 #1
    1. The problem statement, all variables and given/known data

    2 kg ball revolves in a horizontal circle with speed of 1.5 m/s. knowing that L= 600 mm, determine (a) the angle that cord forms withe vertical
    (b) the tension in the cord
    i don't know how to put the figure but this problem is similarly like people practice hammer throwing.
    L= 600 mm is distance of the rope

    2. Relevant equations

    [a][n] = [v][2]/L


    3. The attempt at a solution

    i got this equation; 7.5+19.62cos θ = T
    and 9.81 sin θ =[a][t]

    please help me for the next step
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Sep 30, 2009 #2

    tiny-tim

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    Hi puccafan! :smile:

    (try using the X2 tag just above the Reply box :wink:)
    Yes, a = v2/L, where a of course is horizontal (there is no tangential acceleration).

    But I don't follow your subsequent equations (you're not assuming that the acceleration is along the string, are you? … acceleration is a matter of geometry, not physics :wink:) …

    just resolve T into horizontal and vertical components, and leave g and a as they are.

    What do you get? :smile:
     
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