Quantitative Problem 20.10

  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. LowlyPion

    LowlyPion 5,337
    Homework Helper

  4. yes I have already tried that and I got 2.74sec but in MasteringPhysics it gives me wrong.......

    help me out
     
  5. hage567

    hage567 1,539
    Homework Helper

    Show your calculation so we can see what you did.
     
  6. 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. LowlyPion

    LowlyPion 5,337
    Homework Helper

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