The bar is in static equilibrium W = 15N, Na = 11N

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Discussion Overview

The discussion revolves around a static equilibrium problem involving a bar subjected to various forces, specifically focusing on the calculation of the tension force (T) given the weights and normal forces acting on the bar. The scope includes homework-related problem-solving and the application of static equilibrium principles.

Discussion Character

  • Homework-related
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant presents an attempt to solve for the tension force (T) using the equilibrium of forces and a specified angle (theta = 45 degrees), arriving at T = 4 N.
  • Another participant agrees with the initial calculation but does not provide further analysis.
  • A third participant critiques the problem's definition, noting the absence of distance measurements necessary for applying the principle of moments, suggesting that the solution cannot be verified without this information.
  • A fourth participant suggests that W must be positioned at a specific fraction of the bar's length, implying that its location affects the equilibrium analysis.
  • A fifth participant encourages a more thorough approach to solving the problem by utilizing all equations of equilibrium, indicating that the exact location of Nb could be determined through the principle of moments.

Areas of Agreement / Disagreement

Participants express differing views on the adequacy of the problem's definition and the methods used to solve it. There is no consensus on the validity of the proposed solution or the necessity of additional information.

Contextual Notes

The discussion highlights limitations related to missing distance measurements and the need for a complete definition of the problem to apply the principles of static equilibrium effectively.

Who May Find This Useful

Students and individuals interested in static equilibrium problems, particularly those studying mechanics or related fields in physics and engineering.

indiangeek
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Homework Statement


The bar is in static equilibrium W = 15N, Na = 11N and Nb which is perpendicular to the bar,Nb = 5.66N.What is the magnitude of tension forceT?

Homework Equations





The Attempt at a Solution


W - Na - Nb*sin(theta) = 0;
15 - 11 - 5.66*sin(theta) = 0
theta = 45 deg
Nb*cos(theta) = T
T = 5.66*cos(45)
T = 4 N
But the options given are a)17.79N b)25N c)12N d)21N e)0.9 m^2
solve this problem,,,,,,,,,,,,,
 

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This is not a well-defined problem because distances have not been given. You have used the law of equilibrium for equating forces in two directions, but you have not used the principle of sum of moments is zero. Wht happens if you try to check your answer wiith T=4? That you cannot do without distances (or at least the ratio of the distances on the rod)
 


The bar is at a 45 degree angle. Although the distances are not given, W must be located a certain fraction of the bar length from one end, about half way up ,based on the values given.
 


I would encourage indiangeek to check statics problems using all the equations of equilibrium available. You might be able to determine the exact location of Nb (in relation to W and Na by using the principle of moments. Having done that, the alleged solution T=4 can be checked.
 

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