Problem $4(10$ points$)$

A$)$ Force $F$ is acting along DG on the icosahedron$.$ If you were to

determine the moment of F acting about the bar AC $,$ you could

use which of the following position vectors? $($circle all that apply$)$

$(5$ pts$)$

$r_{CD},r_{DC},r_{DG},r_{CG},r_{AB},r_{AC},r_{AD},r_{CA}$

A$)$ Determine the moment caused by each force about point A$.$ Include the direction of the moment. $(5pts)$

I. Moment due to $F_1$

II$.$ Moment due to $F_2$

III. Moment due to $F_3$