Scalar product Flashcards
1
Q
How to calculate the angle alpha between the two vectors a and b?
A
alpha = arccos((ab)/(|a||b|))
2
Q
What is the scalar product of two orthogonal vectors?
A
0
3
Q
What is the scalar product of two parallel vectors? (length = 1)
A
1
4
Q
When is the dot product negative?
A
The angle is greater than 90 degrees
5
Q
How to calculate the length of a vector?
A
|a| = sqrt(a*a)
