Question

Determine whether the vectors u and v are parallel, orthogonal, or neither.

u = <10, 0>, v = <0, -9>

Answer 1

no :( LOL i don't know how to tell if they are p,o, or neither

Answer 2

@Loser66

Answer 3

uhhh I remember learning a little bit about that a while ago but I really don't know off the top of my head

Answer 4

it be 0 right?

Answer 5

@Loser66

Answer 6

lol I researched the rule :)

Answer 7

it's parallel?

Answer 8

The dot product is basically the product of the magnitudes of two vectors times the cosine of the angle between them. If the angle is 90 degrees, cosine is 0, so the dot product is 0. If the angle is 0 degrees, so cosine is 1, so the dot product is the product of the magnitudes of both vectors.

Answer 9

OH!! nevermind!

Answer 10

I see on another site if the dot prod. is equal to 0 it's perpendicular.

Answer 11

I guess in this case it be neither then. @Loser66 @salehhamadeh

Answer 12

@Loser66 No one learns without exploring. Just as you, I am trying to guide people to the right place.
@alibea Another way to find the dot products is by using their components. For example, <u1, v1> dot <u2, v2> = u1*u2 + v1*v2. Use this formula and tell me what you find.

Answer 13

I got 0 @salehhamadeh

Answer 14

If you get 0, they are orthogonal. If you get the product of both magnitudes, they are parallel. If you get a number in between, they are niether.

Answer 15

@alibea Correct. Now you can solve it, but I suggest that you read more abut vector operations. khanacademy.org has a cool set of videos on these topics. This will give you an intuition on where this formula comes from.
@Loser66 No problem :)

Answer 16

ahh okay! thanks so much for your help both of you :) sometimes when I read things on my own especially with math it looks like a bunch a mumbo jumbo haha glad to have you guys. @salehhamadeh @Loser66

Answer 17

@alibea You're welcome

Answer 18

@salehhamadeh not to bother you but would you mind helping me with another question?:l

Answer 19

@alibea What's your question?