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Another one

  1. Jan 13, 2005 #1
    i kinda also need help on another problem. i can't even start this problem cuz i have no idea how! can someone plz tell me how?

    Tarzan and Jane, whose total mass is 130kg, start their swing on a 5m long vine when the vine is at an angle of 30 degrees with the horizontal. At the bottom of the arc, Jane, whose mass is 50kg, releases the vine . What is the max height at which Tarzan can land on a branch after his swing continues?
     
  2. jcsd
  3. Jan 13, 2005 #2

    dextercioby

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    Consider the application of total mechanical energy conservation law,taking into account the data offered by the problem and a correct drawing which would reflect the unknowns.
    HINT:U have to apply this law twice.
    Daniel.
     
  4. Jan 13, 2005 #3
    ok i got up to this part and i am stuck:
    KEi+PEi=KEf+PEf
    0J+mgh=1/2mv^2+0J
    h=5cos30
    h=4.3m
    v=6.5m/s
    so now what do i do? where do i do this for next and how do i apply it to MEi=MEf??? i am very confused!?
     
  5. Jan 13, 2005 #4

    dextercioby

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    Did u forget the previous problem??The setup is basically the same,it's just that in this case,the masses vary.So your "h" is again a DIFFERENCE.

    Daniel.
     
  6. Jan 13, 2005 #5
    but if i use the same formula with the different masses they cancel out anyway don't they??
     
  7. Jan 14, 2005 #6

    dextercioby

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    Not for the second case,when Tarzan is left all by himself.The mass in one side of the eq.is Tarzan's mass,while on the other side,it's the mass of the 2 "swingers"... :tongue2:

    Daniel.
     
  8. Jan 14, 2005 #7
    You posted this already.... did you look at my response?
     
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