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Dependent motion with ropes question

  1. Mar 3, 2012 #1
    1. The problem statement, all variables and given/known data
    I attached the problem with my attempt. I think the geometry I used is correct but I am getting the wrong answer. When I take the flip Va/V (as shown in my attempt) I get the right answer. I am not even sure if I can relate velocity with a triangle.

    The method I used is based on the fact that Sa + Sb = L1 so when you take the time derivative you get Va = -Vb.
     

    Attached Files:

  2. jcsd
  3. Mar 3, 2012 #2

    ehild

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    X=SA cos(theta). As X increases in the rate of 1.5 m/s, both SA and theta change. It is not true that V=VA.

    Write out YB in terms of X, and find the derivative with respect the time.


    ehild
     
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