Vectors

Geometry Level 2

If A \vec{A} is directed downwards and B \vec{B} is directed towards north, find the direction of B × A \vec{B} \times \vec{A} .

south north east east north west West

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1 solution

Joe Mansley
Jul 28, 2016

Use the right-hand rule. Stick your index and middle fingers and your thumb out so that they are perpendicular to each other. Point your index finger in the direction of B (north) and your middle finger in the direction of A (down), and your thumb should point in the direction of B x A, which turns out to be West.

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