Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫  π  -¹ ² ³ °

You are not logged in.

## #1 2006-09-24 03:25:15

angler
Guest

### Puzzled by vector question.

I have this question on my test preparation sheet. It seems simple but is quite unlike anything I have seen before. Could someone please help me. I don't even know where to start:

Find all unit vectors in the plane determined by u=(3,0,1) and v=(1,-1,1) that are perpendicular to the vector w=(1,2,0).

My friend thought you have to use the cross product of vectors at some point.

Much Appreciated

## #2 2006-09-24 03:32:41

luca-deltodesco
Member
Registered: 2006-05-05
Posts: 1,470

### Re: Puzzled by vector question.

what do you mean determined by u and v? i dont get that part.

The Beginning Of All Things To End.
The End Of All Things To Come.

Offline

## #3 2006-09-24 03:40:50

angler
Guest

### Re: Puzzled by vector question.

So sorry, the smiley default got into the way...

Find all unit vectors in the plane determined by u = (3,0,1) and v = (1,-1,1) that are perpendicular to the vector w = (1,2,0).