After being struck by lightning, Barry Allen wakes up from his coma to discover he's been given the power of super speed, becoming the Flash, fighting crime in Central City. Greg Berlanti, Geoff Johns, Andrew Kreisberg.
vector sum, resultant-a vector that is the sum of two or more other vectors. radius vector-a line connecting a point in space to the origin of a polar coordinate system. radius vector-a line connecting a satellite to the center of the body around which it is rotating.
In Euclidean space (any number of dimensions), given a point p0 and a (nonzero) direction vector d, a line is defined parametrically as the set of points p where p = p0+ td, and where the parameter t varies between -â and +â. This line formalism demonstrates use of direction vector d to specify the run direction of the line.