If east, west, north, south, up and down are representing the direction of unit vectors, then east x south has the direction along_____________?
Correct answer: C. Down
- A. West
- B. North
- C. Down
- D. Up
Explanation
Take east as +i, north as +j, and up as +k; south is therefore -j. East x south = i x (-j) = -(i x j) = -k, which points down. Students may choose b by using the north direction instead of its opposite, south.
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About Vector Product
The vector product, or cross product, gives a vector perpendicular to two multiplying vectors, with magnitude AB sin θ and direction set by the right-hand rule. It covers properties such as anti-commutation, area from cross products, torque and angular momentum. Unlike the dot product, its result is a vector.
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