# Vector Size magnitudes

1. Sep 16, 2008

### BrettL789123

Five vectors are listed below. Select them in order of increasing magnitudes, from shortest to longest. If B is smallest, then A, C, D, and finally E is the largest, enter BACDE (Note: If of equal length, then enter in the order listed.)
A) 17i-23j-23k
B) 22i+30j
C) 18i-28j-26k
D) 37k
E) 36j+23k

2. Sep 16, 2008

### mgb_phys

Get some graph paper and draw them!

3. Sep 16, 2008

### BrettL789123

how do you graph them? how do you graph one that just gives you 1 number?

4. Sep 16, 2008

### Dschumanji

They are given in component vector form. "i" represents the unit vector in the x direction, "j" represents the unit vector in the y direction, and "k" represents the unit vector in the z direction. If one number is given that means the vector is directed in only that direction and has no components in the other directions.

To solve the problem, use the modified version of the pythagorean theorem for 3 dimensions.

5. Sep 16, 2008

### mgb_phys

Sorry I hadn't noticed they were 3d.
Ussually when students draw a vector, the definition of the magnitude leaps out at them!