Question

The cross product of two vectors (X and Y) is a negative vector when the angle between them is:

A. 0
B. 90
C. 180
D. 270

Answer 1

Step-by-step explanation:

The cross product:

[ a × b ] = | a | · | b | · sin α

sin α < 0 if α ∈ (180°, 360°)

Answer:

D. 270°

Answer 2

C. 180

Step-by-step explanation: