Vectors

Question 1

AB vector =

Answer 1

OB-OA

Question 2

vector a and b are parallel if

Answer 2

a=kb where k is a constant

Question 3

|a|

Answer 3

sqrt x^2 + y^2 + z^2

Question 4

unit vector a =

Answer 4

a/|a|

Question 5

vector a angle with x axis

Answer 5

cosθx = x/|a|

Question 6

vector a angle with y axis

Answer 6

cosθy = y/|a|

Question 7

vector a angle with z axis

Answer 7

cosθ = z/|a|