Math Help - vectors problems

1. vectors problems

I dont quite get this problem. I know what the component vector form is but I dont know how this problem is done.
Do you have to find the magnitude within it like Sqrt of x^2+y^2?
Yeah.. Im kind of lost on this one. Thanks for the help if anyone can

1.

2. Originally Posted by takkun0486
I dont quite get this problem. I know what the component vector form is but I dont know how this problem is done.
Do you have to find the magnitude within it like Sqrt of x^2+y^2?
Yeah.. Im kind of lost on this one. Thanks for the help if anyone can

1.
The "x" is the cos 210 = -sqrt(3)/2
The "y" is the sin 210 = -1/2

That means a unit vector is,
-sqrt(3)/2 i - 1/2 j