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Calculate the speed of a body which slides through a string

  1. Apr 23, 2013 #1
    1. The problem statement, all variables and given/known data

    A 200 gram body pierced string can slide through a 1.8 m string, tied at points A and B to a vertical rod around which rotates so that the segment BC is flat. Calculate the speed of the body.

    I don't know where I have to put the body to solve the problem. Here is the schematic:


    I also give the length of the vertical rod, which is 1.2 m. I guess there should draw any trigonometric relationship, find an angle to work with the components. But again, do not know where I put the body to raise the exercise.

    Thank you!
  2. jcsd
  3. Apr 23, 2013 #2


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    welcome to pf!

    hi sv_heavymetal! welcome to pf! :smile:

    your schematic isn't working :redface:

    if i understand it correctly, ACB is a right-angled triangle whose lengths you know, and the body is at C :wink:

    (btw, the body slides along the string, not through it; or the string slides through the body)
  4. Apr 23, 2013 #3


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    ... and the right angle is at the lower of A and B, yes? AB=1.2m, AC+CB=1.8m.
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