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Homework Statement
See attachment, Im getting everyone of these problems wrong.
Homework Equations
[tex]M_y = u_y(r_y X F)[/tex]
Where u=unit vector defining the direction of y axis
r=distance from y axis to any point on the line of action of F
F=acting force
The Attempt at a Solution
I think im going wrong right from the beginning, how do I show the 100N force is cartesian form? What im doing is :
A=1.2i+0j+0k
B=0.6i+0.6j+1.2k
[tex]
AB =\frac{ 0.6i+0.6j+1.2k}{\sqrt{0.6^2+0.6^2+1.2^2}}
[/tex]
[tex]
F_{AB} = (100N)\frac{ 0.6i+0.6j+1.2k}{\sqrt{0.6^2+0.6^2+1.2^2}}
[/tex]
Im not going to bother to post the rest since im pretty sure this isnt how to do this.
Thanks
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