Statics 2.106 - How to Express the force F in Cartesian vector form at the midpoint B of the rod.

Question: Express the force F in Cartesian vector form if it acts at the midpoint B of the rod.

Problem 2-106 from:

Engineering Mechanics: Statics, 14th edition
Russell C. Hibbeler

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[sthabah]

Sir, can u explain me how do you know why F=600.