Vectors Flashcards
1
Q
What is the angle between two vectors?
A
Cos∅ = a • b/ |a||b|
2
Q
What is the formula for components of a vector?
A
r = |r|cosθ i + |r|sinθ j
3
Q
What is the formula for unit vector?
A
^a = ā / |ā|
4
Q
What is the dot product of i • i ?
A
1
(It is the same for k • k, j • j)
5
Q
For a perpendicular or orthogonal vector, what does a • b equal?
A
0, as the angle between them is 90° and cos90° = 0
6
Q
What is the formula for Vector Triple Product a × (b × c) ?
A
a × (b × c) = (a • c)b - (a • b)c
