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I want (only), you to explain to me how to get the direction of the moment in general how i can determine if it's on y or z or x, then show me how to apply it on all the example bleow , in clear writing please, thank you very much

The yield stress is $S_{y}=420×10_{6}$ Critical stress element will be at the wall at $A$ where there is bending and torsion. The exact location of the critical element is as shown in the diagram below: The bending moment and torsion at $A$ are computed as: $M_{y}T?=2500×0.045=112.5Nm=2500×0.09=225Nm?$
the shaft $AB$. [12 poin The yield stress is $S_{y}=420×10_{6}$ Critical stress element will be at the wall at $A$ where there is bending and torsion. The exact location of the critical element is as shown in the diagram below: The bending moment and torsion at $A$ are computed as: $M_{y}M_{z}M_{x}?=500×0.09=45Nm=1500×0.045=67.5Nm=T=1500×0.09=135Nm?$
a) Critical stress element will be at the wall at $A$ where there is i) Two plane bending, ii) torsion and iii) axial loading. The exact location of the critical element will be determined by the bending: $M_{y}=500×0.2=100Nm,M_{z}=250×0.4=100Nm$
b) State whether the structure is structurally safe. ${$ PI $1.4}$ Critical stress element will be at the wall at $A$ where there is bending and torsion. The exact location of the critical element is as shown in the diagram below: There will be bending moment and torsion at $A$ are computed as: $M_{x}=T=250×0.1=25NmM_{z}=250×0.5=125Nm?$

Procedure:Transfer the 2.5 kN load to B by an equal and opposite forces at B.Now calculate the bending moment ad torsion at A.Use the bending stress a