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

Statics Help (Trusses)

  • Thread starter jlg
  • Start date
  • #1
jlg
2
0

Homework Statement


Determine the force in member HE for the truss in the figure. All members are length 0.8m except GH.
570.jpg


The Attempt at a Solution


I solved for the reaction forces at G and got Gx = 1039 N , Gy = -1200 N, A = 1800 N. My professor said to then draw a FBD of G and solve for GF. Am I crazy or is that unsolvable because both GH and GF have an x and y component, so I'd be left with something like:

Fx = GFsin + GH sin = 1039
Fy = GFcos + GH cos = -1200
 

Answers and Replies

  • #2
Am I crazy or is that unsolvable because both GH and GF have an x and y component, so I'd be left with something like:

Fx = GFsin + GH sin = 1039
Fy = GFcos + GH cos = -1200
How many unknowns do you have? How many equations do you have? The above system of equations is very solvable.
 

Related Threads for: Statics Help (Trusses)

  • Last Post
Replies
3
Views
1K
  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
2
Views
1K
  • Last Post
Replies
4
Views
13K
  • Last Post
Replies
5
Views
12K
Replies
1
Views
717
  • Last Post
Replies
1
Views
878
  • Last Post
Replies
1
Views
694
Top