Solving Hooke's Law Problem: Find Delta l

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Homework Help Overview

The problem involves applying Hooke's Law to determine the elongation (delta l) of a pole subjected to a vertical force. The pole has specific dimensions and a force acting on it, but the value for Young's modulus (E) is not provided.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the relationship between the force applied and the elongation of the pole, questioning the necessity of Young's modulus in the calculations. There are attempts to rearrange the formula for delta l, and some participants express uncertainty about the implications of missing values.

Discussion Status

The discussion is ongoing, with participants exploring the implications of the missing Young's modulus value and its effect on calculating the elongation. Some guidance has been offered regarding the necessity of E for the calculations, but no consensus has been reached.

Contextual Notes

The problem lacks a specified value for Young's modulus, which is critical for solving the elongation question. Participants are also clarifying the direction of the force in relation to the pole.

lorik
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Homework Statement



In a pole with dimension lo=5m and section S=20 cm square acts the force of F=20Kn vertically
downwards . How long will it go downwards, ---- thus delta l is needed

Homework Equations



I have delta l /lo =1/ EY *F/S


The Attempt at a Solution



I know the solution is giving me only delta l = 0.25 mm

how do i get delta l from above formula and what about EY which isn't needed ?

Could this be correct delta l = lo/ey * F/s ?
 
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Does the force act along the "direction of the pole"? And aren't you given any value for E?
 
radou said:
Does the force act along the "direction of the pole"? And aren't you given any value for E?

Yes it does . Like its written in the book I see E is not given any number ! that's yungs module btw.
 
If this is the correct statement of the problem, then I don't see how to calculate the elongation without Young's modulus.
 
Your correct thanks for help
 

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