Tension/Resultant Forces

  • Thread starter Auburn2017
  • Start date
  • #1
59
1

Homework Statement


The problem is shown in the image attached.

Homework Equations


∑F = -235i -Fi +Tcos25i + Tsin25j +210cos25i +210sin25j
Moment = r x F[/B]

The Attempt at a Solution


I have tried various things. I tried summing all the moments and then setting that equal to zero to find T. I have tried just adding the forces and setting equal to zero to find T. None of these approaches have helped so far. Right now I am just interested at find T. Could someone just point me in the right direction to start. Thanks much.
 

Attachments

  • delete me.jpg
    delete me.jpg
    38.1 KB · Views: 340

Answers and Replies

  • #2
billy_joule
Science Advisor
1,200
331
I have tried various things. I tried summing all the moments and then setting that equal to zero to find T.

That approach will find T. Show your work and we'll see what went wrong.
 
  • #3
156
15
Chose the positive for finding moment. You must use ΣM=0.
Note M=||rxF||=r.F.sina
 
  • #4
59
1
That approach will find T. Show your work and we'll see what went wrong.

This is what I get. I also know if the distance between the force and the point is perpendicular then the moment just equals rF. If you do this then you can get the right answer but I do not understand the sign on the four terms...
 

Attachments

  • delete me 3.jpg
    delete me 3.jpg
    33.6 KB · Views: 288
Last edited:
  • #5
haruspex
Science Advisor
Homework Helper
Insights Author
Gold Member
2020 Award
35,895
6,636
This is what I get. I also know if the distance between the force and the point is perpendicular then the moment just equals rF. If you do this then you can get the right answer but I do not understand the sign on the four terms...
Let's just consider the moment due to T to begin with. The moment is the force times the perpendicular distance between the axis and the line of action of the force, right? What is that perpendicular distance?
 
  • #6
59
1
Let's just consider the moment due to T to begin with. The moment is the force times the perpendicular distance between the axis and the line of action of the force, right? What is that perpendicular distance?
Easy.. 0.1m
 
  • #7
haruspex
Science Advisor
Homework Helper
Insights Author
Gold Member
2020 Award
35,895
6,636

Related Threads on Tension/Resultant Forces

  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
12
Views
2K
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
2
Views
921
  • Last Post
Replies
4
Views
1K
  • Last Post
Replies
9
Views
3K
  • Last Post
Replies
8
Views
3K
  • Last Post
Replies
2
Views
984
Top