1.

The equilibrium equation obtained by summing all forces on x-direction is ________

A. ( frac{ _x}{ x} + frac{ _{yx}}{ y} + frac{ _{zx}}{ z} +X=0 )
B. ( frac{ _{xy}}{ x} + frac{ _y}{ y} + frac{ _{zy}}{ z}+Y=0 )
C. ( frac{ _{xz}}{ x} + frac{ _{yz}}{ y} + frac{ _z}{ z} +Z=0 )
D. ( frac{ _x}{ x}+ frac{ _{yx}}{ y} + frac{ _{zx}}{ z} = 0 )
Answer» B. ( frac{ _{xy}}{ x} + frac{ _y}{ y} + frac{ _{zy}}{ z}+Y=0 )


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