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A rigid system is subjected to two forces at point $A$ as shown in the figure below. Given $F_{AB}=85\mathrm{.}5i+128\mathrm{.}4j-257\mathrm{.}1k((b)$ 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

Ib$.$ft and its direction is

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

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

$14321952,1758,2565$

CCW or positive sense CW or negative sense

$542$

$782$

$476$

$615$