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Hooke’s law of elasticity
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Law of elasticity discovered by the English scientist Robert Hooke in 1660, which states that, for relatively small deformations of an object, the displacement or size of the deformation is directly proportional to the deforming force or load.
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ABRAcadabra - AirBorne ReArming
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The technology for rearming aircraft with weapons in midair might soon be a reality. This revolutionary technology would enable combat missions, currently requiring dozens of aircraft, to be performed by very few, and to carry out numerous missions by unmanned combat aircraft without returning to base.
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A New Model Nanocar on the Showroom Floor
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Motorized nanocar (illustration) (Credit: Yasuhiro Shirai / Rice University)
A year after the creation of the first nanocar by scientists from Rice University, a new and improved version is on the showroom floor. The new car, which includes a light-driven engine, opens the door to future development of more sophisticated nanomachines that could be used, among other things, for targeted drug delivery within the body.
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Law of nature
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Law of nature, a stated regularity in the relations or order of phenomena in the world (or in logic or mathematics that holds, under a stipulated set of conditions, either universally or in a stated proportion of instances.
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Compton
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Compton effect, increase in wavelength of X-rays and other strong electromagnetic radiations that have been scattered by electrons; it is a principal way in which this penetrating radiant energy is absorbed gradually in matter.
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Black hole
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black hole, in space, postulated object whose mass is so intensely concentrated that normal properties of space in its vicinity are altered drastically and even light cannot escape the gravitational attraction within a certain distance from the centre. No black hole has been certainly identified, and the best way of trying to identify one is still uncertain.
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collective model
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collective model, description of atomic nuclei that incorporates aspects of both the shell model and the liquid-drop model to explain certain magnetic and electric properties that neither of the two separately can explain.
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Adiabatic lapse rate
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adiabatic lapse rate, rate at which the temperature of an air parcel will rise or fall as it descends or ascends, respectively, without exchanging heat with its environment. The temperature change occurs when the parcel moves into regions of varying barometric pressure and either expands (as pressure falls) or contracts (as pressure rises).
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Acceleration
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acceleration, the time rate at which the velocity of a point is changing. Because velocity, being a vector quantity, has both magnitude and direction, acceleration is also a vector quantity and must account for changes in both the magnitude and direction of a velocity.
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