Tension T in a parabolic wire at any point

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SUMMARY

The discussion focuses on calculating the tension T in a parabolic wire under a uniform load w per horizontal foot. Participants highlight the importance of correctly using the equations T² = T₀² + w²x² and y = (w/2T₀)x² to derive T in terms of x, y, and w. A common error identified is the mislabeling of variables, specifically using y instead of y². Correcting this mistake is essential for reaching the target answer.

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  • Understanding of parabolic equations in physics
  • Familiarity with tension calculations in mechanics
  • Knowledge of derivatives and their applications
  • Basic algebra for manipulating equations
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  • Study the derivation of tension in parabolic cables using calculus
  • Explore the application of the equations T² = T₀² + w²x² and y = (w/2T₀)x² in real-world scenarios
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ElectronicTeaCup
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Homework Statement
Assuming that w, the load per horizontal foot, it given, calculate the tension T
Relevant Equations
See (15,16) below
1589367294368.png


I am unsure how to go about this. I tried following the suggestion blindly and end up with with some cumbersome terms that are not the answer. From what I understand the derivative at each point would equal to T?

Answer:
1589367367456.png
I just can seem to get to this. I think I'm there but can't get it in this form

1589367402626.png
 
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ElectronicTeaCup said:
Homework Statement:: Assuming that w, the load per horizontal foot, it given, calculate the tension T
Relevant Equations:: See (15,16) below

View attachment 262705

I am unsure how to go about this. I tried following the suggestion blindly and end up with with some cumbersome terms that are not the answer. From what I understand the derivative at each point would equal to T?

Answer: View attachment 262706 I just can seem to get to this. I think I'm there but can't get it in this form

View attachment 262707
Right at the start you have y on the left instead of y2. Correct that and you should get the target answer.
 
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What's wrong with their suggestion? I assume you got ##T^2 = T_0^2 + w^2 x^2##, and along with ##y =\frac{w}{2T_0} x^2##. That should be sufficient to find ##T## in terms of ##x##, ##y## and ##w##.
 
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haruspex said:
Right at the start you have y on the left instead of y2. Correct that and you should get the target answer.

Yikes! YES, thanks for the catch! I was so frustrated trying to solve this one.
 

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