Find the elongation in the wire

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    Elongation Wire
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SUMMARY

The discussion focuses on calculating the elongation in a wire subjected to varying tension due to external forces. The formula used is ∆l = Fl/YA, where ∆l represents the elongation, F is the force applied, l is the original length, A is the cross-sectional area, and Y is Young's modulus. Participants emphasize the need to consider the tension in the wire, which varies along its length, and suggest integrating the differential elongation dδl = (T dx) / (A Y) to find the total elongation. This approach ensures accurate results by accounting for the changing tension.

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Homework Statement



elongation.jpg

Homework Equations



∆l = Fl/YA

The Attempt at a Solution


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The net acceleration of the system is F/2M .

Force at the right end of the wire will be F towards right .

Force at the left end of the wire will be F/2 towards left .

Now how should I take the two forces into account ?
 

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1) Consider an infinitesimal element at a distance ##x## from the end with the box.
2) Make force diagram for that element.
3) Would the tension in the rod be same everywhere?
 
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PumpkinCougar95 said:
1) Consider an infinitesimal element at a distance ##x## from the end with the box.
2) Make force diagram for that element.
3) Would the tension in the rod be same everywhere?

No . Tension in the rod will not be same everywhere .

I can find the tension at any point . But please explain how will I find the total elongation ?
 
Find the elongation of an element ##dx##. You can use: $$ d \delta l = \frac {T dx} {A Y} $$ where ## \delta l ## is the total elongation. Then just integrate.
 
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Thanks !
 

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