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Circular Motion Speed

  1. Feb 8, 2012 #1
    1. The problem statement, all variables and given/known data
    A 0.55 kg stone attached to a string is whirled in a horizontal circle of radius 19 cm as in the figure below. The string makes an angle of 35° with the vertical.


    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Feb 8, 2012 #2

    tiny-tim

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    hi azncocoluver! :wink:

    show us what you've tried, and where you're stuck, and then we'll know how to help! :smile:

    (oh, and what actually is the question asking for? :redface:)
     
  4. Feb 8, 2012 #3
    Haha wow, I totally forgot to put the question.
    (a) Find the speed of the stone.
    m/s

    (b) Find the tension in the string.
    N

    I have no idea where to start. :[
     
  5. Feb 8, 2012 #4

    tiny-tim

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    hi azncocoluver! :smile:

    nearly all dynamics questions boil down to good ol' Newton's second law (F = ma) …

    so the first step is to draw a diagram with the forces and acceleration labelled,

    and the second step is to write out the equation :wink: …​

    what do you get? :smile:
     
  6. Feb 8, 2012 #5
    Ft = Fg?
     
  7. Feb 8, 2012 #6

    tiny-tim

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    where's the acceleration (and the angles)? :redface:
     
  8. Feb 8, 2012 #7
    No clue lol.. can you show me the solution because I've never done a problem like this before. I kind of learn better when I see an approach first :]
     
  9. Feb 8, 2012 #8

    Mark44

    Staff: Mentor

    That's not the way it works here at Physics Forums.

    In case you haven't seen the forum rules (https://www.physicsforums.com/showthread.php?t=414380), I have copied parts of them that are relevant to your post (emphasis added).
     
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