Thread: Unit Vector Question

The question I am having problems with is:

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

and v = 2j-k.

Can anyone help me solve this?

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

are you familiar with cross products ? if so your answer is given by

Yeh I can do cross products, thanks for the very quick responce and help!

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?

Originally Posted by haku

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.

Please always start a new thread, do not add to an existing one.
You want to find values such that .