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Question: i understand the basic steps of summing the forces in...

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Statics Practice Quiz 01: 10kN 5kN 220kN 2 A C 15 kN (m Find the axial force in bar A-C to the nearest 0.1 kN. Clearly box your final answer

I understand the basic steps of summing the forces in the x-direction and the y-direction, then taking a moment around a point. However, I would really appreciate some clarification on how we know which forces to include in the moments/summations. In other walk throughs, they only include certain forces, for reasons I am not aware of.

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