Question: The three concurrent forces acting on the post produce a resultant force F R = 0 . If F 2 = 1 2 F 1

The three concurrent forces acting on the post produce a resultant force FR=0. If F2=12F1, and F1 is to be 90 from F2 as shown below, determine the required magnitude of F3 expressed in terms of F1 and the angle (Hint: you may want to rotate the coordinate system x-y into a new coordinate system aligned with F1 and F2 directions).
The three concurrent forces acting on the post

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