Principle of virtual velocities
- 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.
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Heat and cold have a virtual transition, without
communication of substance. --Bacon.
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Every kind that lives,
Fomented by his virtual power, and warmed. --Milton.
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2. Being in essence or effect, not in fact; as, the virtual
presence of a man in his agent or substitute.
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A thing has a virtual existence when it has all the
conditions necessary to its actual existence.
--Fleming.
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To mask by slight differences in the manners a
virtual identity in the substance. --De Quincey.
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{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.
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The Collaborative International Dictionary of English.
2000.
Look at other dictionaries:
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. [1913 Webster] Heat and cold have a virtual transition,… … The Collaborative International Dictionary of English
Virtual focus — 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. [1913 Webster] Heat and cold have a virtual… … The Collaborative International Dictionary of English
Virtual image — 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. [1913 Webster] Heat and cold have a virtual… … The Collaborative International Dictionary of English
Virtual moment — 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. [1913 Webster] Heat and cold have a virtual… … The Collaborative International Dictionary of English
Virtual velocity — 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. [1913 Webster] Heat and cold have a virtual… … The Collaborative International Dictionary of English
Virtual work — 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. [1913 Webster] Heat and cold have a virtual… … The Collaborative International Dictionary of English
virtual work — 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. [1913 Webster] Heat and cold have a virtual… … The Collaborative International Dictionary of English
D'Alembert's principle — Classical mechanics Newton s Second Law History of classical mechanics … Wikipedia
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Galileo Galilei — Galileo Galilei † Catholic Encyclopedia ► Galileo Galilei Generally called GALILEO. Born at Pisa, 15 February, 1564; died 8 January, 1642. His father, Vincenzo Galilei, belonged to a noble family of straitened fortune, and had… … Catholic encyclopedia
