How Long Does It Take a Pulse to Travel Across a Ravine When a Rope is Plucked?

In summary, the conversation discusses the calculation of how long it will take for a pulse to travel across a ravine, given a rope with a mass of 25.0 kg and a force of 415 N being pulled on one end. The calculation results in a time of 2.74 seconds, but there may be a question of precision in accepting this answer. The person asking for help is looking for suggestions on how to improve their answer.
  • #1
dsptl
64
0
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
 
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  • #3
yes I have already tried that and I got 2.74sec but in MasteringPhysics it gives me wrong...

help me out
 
  • #4
Show your calculation so we can see what you did.
 
  • #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
 
  • #6
Your calculation looks correct. I can only suggest that there is a question of precision in accepting your answer.
 
  • #7
i have only one trial left and i don't want to take risk...please suggest me an answer
 

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