# Definition of Velocities. Meaning of Velocities. Synonyms of Velocities

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## Definition of Velocities

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Principle of virtual velocities
Virtual Vir"tu*al (?; 135), a. [Cf. F. virtuel. See Virtue.] 1. Having the power of acting or of invisible efficacy without the agency of the material or sensible part; potential; energizing. Heat and cold have a virtual transition, without communication of substance. --Bacon. Every kind that lives, Fomented by his virtual power, and warmed. --Milton. 2. Being in essence or effect, not in fact; as, the virtual presence of a man in his agent or substitute. A thing has a virtual existence when it has all the conditions necessary to its actual existence. --Fleming. To mask by slight differences in the manners a virtual identity in the substance. --De Quincey. Principle of virtual velocities (Mech.), the law that when several forces are in equilibrium, the algebraic sum of their virtual moments is equal to zero. Virtual focus (Opt.), the point from which rays, having been rendered divergent by reflection of refraction, appear to issue; the point at which converging rays would meet if not reflected or refracted before they reach it. Virtual image. (Optics) See under Image. Virtual moment (of a force) (Mech.), the product of the intensity of the force multiplied by the virtual velocity of its point of application; -- sometimes called virtual work. Virtual velocity (Mech.), a minute hypothetical displacement, assumed in analysis to facilitate the investigation of statical problems. With respect to any given force of a number of forces holding a material system in equilibrium, it is the projection, upon the direction of the force, of a line joining its point of application with a new position of that point indefinitely near to the first, to which the point is conceived to have been moved, without disturbing the equilibrium of the system, or the connections of its parts with each other. Strictly speaking, it is not a velocity but a length. Virtual work. (Mech.) See Virtual moment, above.

## Meaning of Velocities from wikipedia

- Consider an object A moving with velocity vector v and an object B with velocity vector w; these absolute velocities are typically expressed in the same...
- The phase velocity of a wave is the rate at which the wave propagates in any medium. This is the velocity at which the phase of any one frequency component...
- parameters. Peculiar velocities can also contain useful information about the universe. The connection between correlated peculiar velocities and m**** distribution...
- In turbomachinery, a velocity triangle or a velocity diagram is a triangle representing the various components of velocities of the working fluid in a...
- 000 lightseconds per traveler second. Proper velocity is also useful for comparing relative velocities along a line at high speed. In this case p A C...
- confinement; detonation velocities are generally around 1700 m/s but can be as high as 3000 m/s. Solid explosives often have detonation velocities ranging beyond...
- velocity—it can be determined if it moves periodically due to the influence of an exoplanet companion. From the instrumental perspective, velocities are...
- Wave velocity may refer to: Phase velocity, the velocity at which a wave phase propagates Pulse wave velocity, the velocity at which a pulse travels through...
- continuum mechanics the flow velocity in fluid dynamics, also macroscopic velocity in statistical mechanics, or drift velocity in electromagnetism, is a...
- velocity of zero m**** test particles. For zero m**** test particles we have that the 'relative to the other' and the 'barycentric' escape velocities are...