• Support PF! Buy your school textbooks, materials and every day products Here!

Static Equilibrium don't understand something

  • #1
Femme_physics
Gold Member
2,547
1
Static Equilibrium....don't understand something

http://img135.imageshack.us/img135/4664/helpo.jpg [Broken]


Look at the equation at "sum of all forces on y axis" and please tell me: How the heck did 0.4Na -mg = 0 turn into Na = 2.5m g?
 
Last edited by a moderator:

Answers and Replies

  • #2
RonL
Gold Member
1,096
215


http://img135.imageshack.us/img135/4664/helpo.jpg [Broken]


Look at the equation at "sum of all forces on y axis" and please tell me: How the heck did 0.4Na -mg = 0 turn into Na = 2.5m g?
Sorry I can't do math, but I think you will find the answer if you look at the pipe thickness (100mm) and the vertical distance between A and B (200mm).
 
Last edited by a moderator:
  • #3
Femme_physics
Gold Member
2,547
1


What do these distances have to do though with the sum of all forces on the y axis? Distances are only used in moments equations.
 
  • #4
Doc Al
Mentor
44,867
1,114


Look at the equation at "sum of all forces on y axis" and please tell me: How the heck did 0.4Na -mg = 0 turn into Na = 2.5m g?
Hint: 1/0.4 = ?
Or: 2.5 X 0.4 = ?
 
  • #5
Femme_physics
Gold Member
2,547
1


Oh, that's right, how could I forget that always in life we're followed by an invisible multiple of one...heh, thanks, I'll see how solvable it gets now :)
 

Related Threads for: Static Equilibrium don't understand something

Replies
17
Views
568
Replies
4
Views
1K
  • Last Post
Replies
2
Views
1K
  • Last Post
Replies
0
Views
1K
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
5
Views
2K
  • Last Post
Replies
9
Views
2K
  • Last Post
Replies
2
Views
389
Top