Radius Vector

The vector r from the origin to the current position. It is also called the position vector. The derivative of r satisfies

[画像: r·(dr)/(dt)=1/2d/(dt)(r·r)=1/2d/(dt)(r^2)=r(dr)/(dt)=rv, ]

where v is the magnitude of the velocity (i.e., the speed).

See also

Radius, Speed, Velocity

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Cite this as:

Weisstein, Eric W. "Radius Vector." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/RadiusVector.html

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