Solve Shear Force & Moment Equation Homework

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SUMMARY

The forum discussion centers on solving shear force and moment equations in structural analysis, specifically addressing a problem involving a 3 kip force. The confusion arises regarding the moment equation's reference to both Ay and Ax while only considering the force in one direction. The correct approach involves recognizing the force's components, where Fx = 3 sin(30°) and Fy = 3 cos(30°). For calculating moments about point B, using the resultant force F simplifies the process compared to summing individual component moments.

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Homework Statement


The problem and the solution are in attached.


Homework Equations





The Attempt at a Solution



What I'm confused about is the moment equation. Why does the equation reference both Ay and Ax, but it only considers the 3 kip force in one direction. Why doesn't it have an x-component, and a y-component?
 

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tj1989 said:

Homework Statement


The problem and the solution are in attached.


Homework Equations





The Attempt at a Solution



What I'm confused about is the moment equation. Why does the equation reference both Ay and Ax, but it only considers the 3 kip force in one direction. Why doesn't it have an x-component, and a y-component?
It does, Fx = 3 sin30 and Fy = 3 cos 30. When summing moments about B, however, it is easier to use the resultant force F in calculating the moment, rather than use the sum of its component moments to calculate the moment.
 

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