Vectors, scalars and unidentified

• Dec 29th 2007, 05:32 AM
dankelly
Vectors, scalars and unidentified
I need help explaining the working out behind these.

Given vectors A,B and C in 3d space,
state whether they are scalar, vectors or unidentified.
I have the answers I just need the explanation..

(AXB).C = scalar
(A.B)XC = unidentified
(A.B).C = unidentified

How do you tell if these are scalars, vectors or unidentified?
• Dec 29th 2007, 05:44 AM
Plato
The two operations, dot product and cross product, are operations on vectors.
The dot product yields a scalar while the cross product yields another vector.
Using either of these operations between a vector and a scalar is undefined.
• Dec 29th 2007, 07:02 AM
dankelly
Thanks alot I understand the concept now, also could you clarify these two meanings with regards to vectors?
Whats the difference between Orthogonal and perpendicular?

I know to be Orthogonal is two vectors having an inner product equal to zero. But is this what perpendicular means? is it the same thing? the inner product equals zero?

Any help would be gr8!