What is the Moment Produced by a Force at the Origin?

[khutch2212]

F = 5i + 3j Newtons acts 3 m to the right of the origin (x is horizontal and y is vertical). What moment does this force produce about the origin? Use the vector cross product.
"Great works are performed

 

[SteamKing]

OK, show us what you have tried.

 

[khutch2212]

I really don't know where to start, b/c I don't understand how I am suppost to use the cross product with one vector.

 

[SteamKing]

Who says you have only one vector? Remember, a vector has magnitude and direction.

 

[Allenman]

Does this help?

$\bar{M}_{o} = \bar{R}$ X $\bar{F}$