The question I am having problems with is:

Find a unit vector perpendicular tou=i+3k

andv= 2j-k.

Can anyone help me solve this?

I know that u.v = 0 if they are perpendicular, thanks.

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- Mar 27th 2008, 01:56 PMhakuUnit Vector Question
The question I am having problems with is:

Find a unit vector perpendicular to**u**=**i**+3**k**

and**v**= 2**j**-**k**.

Can anyone help me solve this?

I know that u.v = 0 if they are perpendicular, thanks. - Mar 27th 2008, 01:59 PMbobak
are you familiar with cross products ? if so your answer is given by $\displaystyle \frac{u \times v}{|u \times v|}$

- Mar 27th 2008, 02:01 PMhaku
Yeh I can do cross products, thanks for the very quick responce and help!

- Mar 27th 2008, 02:11 PMhaku
I also have a problem solving this question:

Find the values of a and b such that u = (1,a,2b) and v = (-3,1,4) are parallel. I tried equating the terms but I'm not getting anywhere. a+8b-3=0. Can you help? - Mar 27th 2008, 02:24 PMPlato