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Quantitative Problem 20.10 
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#1
Jan1909, 08:02 PM

P: 73

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
Jan1909, 08:16 PM

HW Helper
P: 5,341



#3
Jan1909, 08:32 PM

P: 73

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


#4
Jan1909, 08:43 PM

HW Helper
P: 1,539

Quantitative Problem 20.10
Show your calculation so we can see what you did.



#5
Jan1909, 08:54 PM

P: 73

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
Jan1909, 11:06 PM

HW Helper
P: 5,341

Your calculation looks correct. I can only suggest that there is a question of precision in accepting your answer.



#7
Jan2009, 08:15 AM

P: 73

i have only one trial left and i don't wanna take risk...please suggest me an answer



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