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With what minimum speed must Jane begin her swing in order to just make it to Charlie

  1. Jan 11, 2009 #1
    1. The problem statement, all variables and given/known data
    Vernie, whose mass is 45.0 kg, needs to swing across a river filled with crocodiles in order to rescue Charlie,whose mass is 75.0 kg. However, she must swing into a constant horizontal wind force on a vine that is
    initially at an angle of θ with the vertical. The width of the river between them is D = 60.0 m, F = 120 N, Length of

    the rope L = 45.0 m, and θ = 60.0°.
    (a) With what minimum speed must Jane begin her swing in order to just make it to the other side?
    (b) Once the rescue is complete, Vernie and Charlie must swing back across the river. With what minimum

    speed must they begin their swing?



    2. Relevant equations
    L=L-(Lcosθ)
    KE = 1/2mv2
    PE = mgh.


    3. The attempt at a solution
    PE = KE
    mgh = 1/2mv2
     
  2. jcsd
  3. Jan 11, 2009 #2

    Doc Al

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    Staff: Mentor

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