ch03-p061 - 61. We note that the set of choices for unit...

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61. We note that the set of choices for unit vector directions has correct orientation (for a right-handed coordinate system). Students sometimes confuse “north” with “up”, so it might be necessary to emphasize that these are being treated as the mutually perpendicular directions of our real world, not just some “on the paper” or “on the blackboard” representation of it.
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