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The diagonal of a unit square, for example, is radical(2).
The distance light travels in an hour. This unit is not used as frequently as the light-year, for example. Distances within the solar system might be expressed in light-hours, but another unit - the astronomical unit - is more commonly used.
An AU (Astronomical Unit) is the average distance from Earth to Sun - about 150 million kilometers. Multiply by this number.An AU (Astronomical Unit) is the average distance from Earth to Sun - about 150 million kilometers. Multiply by this number.An AU (Astronomical Unit) is the average distance from Earth to Sun - about 150 million kilometers. Multiply by this number.An AU (Astronomical Unit) is the average distance from Earth to Sun - about 150 million kilometers. Multiply by this number.
In real life unit vectors are used for directions, e.g east, north and up(zenith). The unit vector specifies the direction. Gyroscopes maintain a direction and keep things level. Whenever and where ever location is important, unit vectors are a part of real life. Whenever directions are important in your real life, then unit vectors are important. If everything was confined to move along a straight line, then unit vectors would not be important. If you can move in a plane, then unit vectors are important. Moving in space, unit vectors are more important. cars, ships and planes all move in space. Controlling and tracking these all involve unit vectors.
None of them.