Hooke’s claim on the law of gravity
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Since ancient times, Aristotle has represented the universe as transparent concentric spheres, with the Earth in the center, then, outwardly, the spheres of the Moon, the planets, and the fixed stars. But he did not try to give any explanation … Read More

Newton’s action at a distance – Different views
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Different authors have attempted to clarify the aspects of remote action and God’s involvement on the basis of textual investigations, mainly from the Mathematical Principles of Natural Philosophy, (Newton, 1999b) Newton’s correspondence with Richard Bentley (1692/93), (Bentley 1693) and Queries … Read More

Time Travel
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Time travel involves traveling in a time different from the present, in the past or in the future, basically without a space travel with reference to a local coordinate system. Time travel can be made by a material body that … Read More

Eugenics
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Nicolae Sfetcu nicolae@sfetcu.com The term eugenics as a practice and field of study was invented by Francis Galton in 1883, in his book Inquiries into Human Faculty and Its Development (F. Galton 1983) based on the recent work of his … Read More

Linear motion
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In physics, and more particularly in mechanics, a linear motion is a movement that takes place along a straight line. During a rectilinear motion, the velocity vector v retains its direction, its value being able to remain constant (uniform linear … Read More

History of physics in prehistory and antiquity
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The history of physics traces the origin and evolution of currents of thought and knowledge in the physical sciences. Themes Several parallel issues overlap over the centuries: determinism and probabilistic physics; Laplace has scarcely conceived the project of a total … Read More

Nature of scientific concepts
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 (Naïve realism argues we perceive the world directly) Science is concerned both by the utterance of hypotheses concerning the nature of the world, and the verification of these theories as adequate to reality according to an experimental method, which differs … Read More

Schrödinger equation
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Schrödinger equation, developed by the Austrian physicist Erwin Schrödinger in 1925, is a fundamental equation in quantum mechanics. It describes the evolution over time of a massive non-relativistic particle, and thus fulfills the same role as the fundamental relation of … Read More

Scientific laws
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A scientific law is a scientific proposition that affirms a constant relationship between two or more variables or factors, each of which represents a property or measurement of specific systems. It is also defined as a constant and invariable rule and norm of things, arising from its first cause or its qualities and conditions. It … Read More

Propositional logic
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Propositional logic (propositional calculus, statement logic, sentential calculus, sentential logic, or sometimes zeroth-order logic) is part of the mathematical logic. Its purpose is the study of the logical relations between “propositions” and defines the formal laws according to which the … Read More

Special theory of relativity
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Special Theory of Relativity (or Special relativity) is the formal theory elaborated by Albert Einstein in 1905 in order to draw all the physical consequences of Galilean relativity and the principle according to which the speed of light in a … Read More

Scientific instruments
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A scientific instrument is an instrument used in science to acquire data, from nanoscale to macroscopic scales. These are mostly measuring instruments (spectrometer for example) or observation (polarizing microscope for example) or, more and more, both at once. Characterizations An … Read More

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