# Vector physics help

1. Oct 30, 2007

### Cowtipper

Question 1:

1. The problem statement, all variables and given/known data
Vector A points north and vector B points east. If C = B - A, then vector C points...

A) north of east
B) south of east
C) north of west
D) south of west

2. Relevant equations

3. The attempt at a solution

I know the answer is "south of east" (or at least I'm 99% sure). But why? I don't understand why, exactly. Can someone please explain? Thanks, I really appreciate the help.

Question 2:

1. The problem statement, all variables and given/known data
Vector A is 3.0 units in length and points along the positive x-axis; vector B is 4.0 units in length and points along a direction 150 degrees from the positive x-axis. What is the magnitude of the resultant when vectors A and B are added?

2. Relevant equations

3. The attempt at a solution

This is an image I made that I think shows what they are talking about. From there, I'm not too sure where to go...

Thanks again.

2. Oct 30, 2007

### Kurdt

Staff Emeritus
For question 1, how is the difference of a vector defined. Or how have you been shown to calculate the difference of a vector.

For question 2, you haven't posted any imagebut what have you learned about vector addition and finding the magnitudes of vectors?

3. Oct 30, 2007

### tyco05

A diagram is your best friend.