- #1
Troubleshooting Line Tension: Expert Tips and Solutions
Click For Summary
Discussion Overview
The discussion revolves around troubleshooting a problem related to line tension in a physics context, specifically focusing on calculating tension forces and reaction forces at a point of support. Participants are sharing their approaches and calculations, seeking clarification and assistance.
Discussion Character
- Technical explanation
- Mathematical reasoning
- Debate/contested
Main Points Raised
- One participant presents calculations for tension (T) and reaction force (R) based on a free body diagram, expressing uncertainty about their correctness.
- Another participant questions the number of equilibrium equations applicable to the problem, suggesting that there could be at most six equations available.
- A participant identifies three components of the reaction force at point A (Fx, Fz, Fy) but does not provide specific calculations for them.
- Concerns are raised about the clarity and correctness of a referenced document, indicating potential issues with the representation of forces and units.
- There is a request for clarification on which free body diagram is being used for the equilibrium analysis related to the tension equation presented.
Areas of Agreement / Disagreement
Participants do not appear to reach a consensus on the correctness of the calculations or the approach being taken. Multiple viewpoints and questions remain unresolved.
Contextual Notes
There are indications of missing assumptions regarding the free body diagram and the forces considered, as well as potential inconsistencies in the units used in the calculations.
Who May Find This Useful
This discussion may be useful for individuals interested in physics problem-solving, particularly in the context of tension forces and equilibrium analysis in mechanical systems.
- #2
tiny-tim
Science Advisor
Homework Helper
- 25,837
- 258
Hi drkidd22! 
Show us what you've tried, and where you're stuck, and then we'll know how to help!
Show us what you've tried, and where you're stuck, and then we'll know how to help!
- #3
drkidd22
- 59
- 0
So I have this so far trying to find Tbd.
It will be the same for Tbe as they are the same distance away from A.
It will be the same for Tbe as they are the same distance away from A.
- #4
drkidd22
- 59
- 0
distance on horizontal=√(18^2+18^2)=18*√2 ft
distance on vertical=21 ft
∴θ=angle in between pole & cable=tan-1(18*√2/21)=50.479 degree
Σall horizontal force=0
1680=2T sinθ
∴T=1088.944 lb
Σall vertical force =0
R=2T cosθ [R= reaction force at A ]
∴R=1385.924 lb
Not sure if it's correct
distance on vertical=21 ft
∴θ=angle in between pole & cable=tan-1(18*√2/21)=50.479 degree
Σall horizontal force=0
1680=2T sinθ
∴T=1088.944 lb
Σall vertical force =0
R=2T cosθ [R= reaction force at A ]
∴R=1385.924 lb
Not sure if it's correct
- #5
pongo38
- 739
- 27
How many components are there to the reaction at A (at most)? You ask if it is correct. But you could determine this yourself by recognising that there are at most 6 equilibrium equations for the whole thing...
- #6
drkidd22
- 59
- 0
There are three forces at A
Fx
Fz
Fy
Fx
Fz
Fy
- #7
pongo38
- 739
- 27
So have you calculated any of them so far?
(By the way your physicsp148.doc document has just one line and it is sloppy, or incorrect or inconsistent. If T is a force, why do the units have ft at the end?)
(By the way your physicsp148.doc document has just one line and it is sloppy, or incorrect or inconsistent. If T is a force, why do the units have ft at the end?)
- #8
pongo38
- 739
- 27
when you say "1680=2T sinθ ", exactly what free body diagram are you considering the equilibrium of?
Similar threads
Engineering
Problem using Pulleys with Weight in Equilibrium
- · Replies 11 ·
Engineering
Loads on a shaft with V-Belts
- · Replies 2 ·
- · Replies 9 ·
- · Replies 2 ·
Engineering
Elongation of a bar problem | Timoshenko
- · Replies 4 ·
- · Replies 3 ·
- · Replies 2 ·
- · Replies 29 ·
- · Replies 2 ·