A rigid system is subjected to two forces at point $A$ as shown in the figure below. Given $F_{AB}=85\mathrm{.}5i+128\mathrm{.}4j-257\mathrm{.}1k(lb)$ and $F_{AD}=63\mathrm{.}2i-189\mathrm{.}6k($lb$).$ Note that point A is in y z plane.

a$)$ The magnitude of moment caused by force $F_{AB}$ about $y-$axis is $$ lb$.$ft and its direction is $$

b$)$ The magnitude of moment caused by force $F_{AD}$ about $OB$ is lb$.$ft and its direction is J$.$

c$)$ The resultant moment due to $F_{AB}$ and $F_{AD}$ about origin O is $|$lb$.$ft

$\backslash$table$[[1952,2565,1432,1758]]$

CW or negative sense

CCW or positive sense

$615782476542$

CCW or positive sense

CW or negative sense

$-12786i+4461j-2974k$

$-7634i+2347j-1964k$

$-9853i+1864j-3625k$

$-9853i+3625j-1864k$

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