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Quantitative Problem 20.10

  1. Jan 19, 2009 #1
    A rope with a total mass of 25.0 kg is tied to a tree on one side of a 125 meter wide ravine, and you're pulling on the other end of the rope with a force of 415 N. If you pluck the rope, how long will it take the pulse to travel across the ravine to the tree?

    Please Help me out
     
  2. jcsd
  3. Jan 19, 2009 #2

    LowlyPion

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  4. Jan 19, 2009 #3
    yes I have already tried that and I got 2.74sec but in MasteringPhysics it gives me wrong.......

    help me out
     
  5. Jan 19, 2009 #4

    hage567

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    Show your calculation so we can see what you did.
     
  6. Jan 19, 2009 #5
    So, u = 25/125 = 1/5 kg/m
    So, T = sqrt(415 kg m/s^2 / (1/5 kg/m)) = sqrt( 415*5 m^2/s^2) = sqrt(2075) m/s = 45.55 m/s

    then I did t = d/v = 125m/45.55m/s = 2.74sec
     
  7. Jan 19, 2009 #6

    LowlyPion

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    Your calculation looks correct. I can only suggest that there is a question of precision in accepting your answer.
     
  8. Jan 20, 2009 #7
    i have only one trial left and i don't wanna take risk...please suggest me an answer
     
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