If the cross product of two vectors vanishes, what can you say about their directions?

parallel

Explanation:

The cross product is binary operation in between two vectors which are in three dimensional space. The cross product of two linearly independent vectors is itself a vector lies in a plane perpendicular to both. It is denoted by symbol x.

c = a x b

⇒c = a b sin θ

If the cross product of two vectors is zero that is it vanishes, it means the vectors are parallel.

a x b = 0

⇒θ = 0° or 180°

i would think it's food chain

close lines strong magnet less close weaker