Question

solve 4th

full answer plz urgent

Answer 1

If we , see the diagram  three co planar forces in equilibrium are concurrent.
We can form a close polygon, when we connect head to tail  manner.
Please refer the attachment.

Equilibrium Of Concurrent Force System :
In general a Body is said to be in equilibrium when the forces acting upon it has zero resultant.

Conditions of static equilibrium of Concurrent Forces :

1. Sum of all forces in X direction is zero:

∑Fₓ=0 or ∑FH=0

600 Cosθ=200
Cos θ=200/600       
  = 1/3
θ=70.5 ° Answer 

2. Sum of all forces in Y direction is zero:

∑Fy=0 or ∑Fv=0

N+600sinθ=800
N+600 sin(70.5)=800
N+600×0.94264=800
N=800-565.584
N=234.416 lb
=234.416 lb  is the Answer