Understanding the Right Hand Rule: Determining Direction Using Cross-Products

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SUMMARY

The discussion centers on determining the direction of the vector x using the Right Hand Rule and cross-products in a three-dimensional coordinate system. Given the orientations where z represents east and y represents north, the conclusion is that x must be down, as the only available options are down or up, with up not being listed. The correct application of the cross-product equations is highlighted, specifically x = y x z resulting in x being down.

PREREQUISITES
  • Understanding of vector cross-products
  • Familiarity with the Right Hand Rule
  • Knowledge of three-dimensional coordinate systems
  • Basic grasp of vector orientation and direction
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  • Study vector cross-product calculations in detail
  • Explore the Right Hand Rule applications in physics
  • Learn about three-dimensional vector representations
  • Review examples of vector orientation in various contexts
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Students in physics or mathematics, educators teaching vector calculus, and anyone interested in mastering three-dimensional vector analysis.

Tiven white
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Homework Statement



If z is east and y is north then x is?
A. West
B. East
C. North
D. South
E. Down

Homework Equations


I have trued getting the proper orientation but the direction I would have obtained is not an option 'up' a comment would be appreciated


The Attempt at a Solution

 
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Obviously, it can be either up or down. Assuming one of the given answers must be correct, that must be "down".

To see that, you would need to twist your arm quite severely. Align your middle finger (Z) with East and your index finger with South. Then your thumb will be Up. Now to make your index index finger point North as described, you would need to rotate your hand about your middle finger.
 
You did not define the equation for the cross-product vector x.

If x = y x z then x is down.
If x = z x y then x is up.

EDIT: OK, never mind, you did not have "up" as one of your choices. So voko answered the question.
 

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