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VIS 音标拼音: [v'ɪs] 语单交互式系统 语单互动式系统 Vis \ Vis\, n. 1. Force; power. [ 1913 Webster] 2. ( Law) ( a) Physical force. ( b) Moral power. [ 1913 Webster] { Principle of vis viva} ( Mech.), the principle that the difference between the aggregate work of the accelerating forces of a system and that of the retarding forces is equal to one half the vis viva accumulated or lost in the system while the work is being done. { Vis impressa} [ L.] ( Mech.), force exerted, as in moving a body, or changing the direction of its motion; impressed force. { Vis inertiae}. [ L.] ( a) The resistance of matter, as when a body at rest is set in motion, or a body in motion is brought to rest, or has its motion changed, either in direction or in velocity. ( b) Inertness; inactivity. Note: Vis intertiae and inertia are not strictly synonymous. The former implies the resistance itself which is given, while the latter implies merely the property by which it is given. { Vis mortua} [ L.] ( Mech.), dead force; force doing no active work, but only producing pressure. { Vis vitae}, or { Vis vitalis} [ L.] ( Physiol.), vital force. { Vis viva} [ L.] ( Mech.), living force; the force of a body moving against resistance, or doing work, in distinction from vis mortua, or dead force; the kinetic energy of a moving body; the capacity of a moving body to do work by reason of its being in motion. See { Kinetic energy}, in the Note under { Energy}. The term vis viva is not usually understood to include that part of the kinetic energy of the body which is due to the vibrations of its molecules. [ 1913 Webster] |
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