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  • Matrix mechanics — Quantum mechanics Uncertainty principle …   Wikipedia

  • Time in physics — In physics, the treatment of time is a central issue. It has been treated as a question of geometry. One can measure time and treat it as a geometrical dimension, such as length, and perform mathematical operations on it. It is a scalar quantity… …   Wikipedia

  • Hamiltonian mechanics — is a re formulation of classical mechanics that was introduced in 1833 by Irish mathematician William Rowan Hamilton. It arose from Lagrangian mechanics, a previous re formulation of classical mechanics introduced by Joseph Louis Lagrange in 1788 …   Wikipedia

  • Clock — For other uses, see Clock (disambiguation). Timepiece redirects here. For the Kenny Rogers album, see Timepiece (album). Platform clock at King s Cross railway station, London …   Wikipedia

  • electricity — /i lek tris i tee, ee lek /, n. 1. See electric charge. 2. See electric current. 3. the science dealing with electric charges and currents. 4. a state or feeling of excitement, anticipation, tension, etc. [1640 50; ELECTRIC + ITY] * * *… …   Universalium

  • Fishing reel — A spinning reel A fishing reel is a cylindrical device attached to a fishing rod used in winding the line .[1] Modern fishing reels usually have fittings which make it easier to retrieve the line and deploy ( cast ) it for better accuracy or… …   Wikipedia

  • Path integral formulation — This article is about a formulation of quantum mechanics. For integrals along a path, also known as line or contour integrals, see line integral. The path integral formulation of quantum mechanics is a description of quantum theory which… …   Wikipedia

  • Verge escapement — showing (c) crown wheel, (v) verge, (p,q) pallets Ve …   Wikipedia

  • Rotating wave approximation — The rotating wave approximation is an approximation used in atom optics and magnetic resonance. In this approximation, terms in a Hamiltonian which oscillate rapidly are neglected. This is a valid approximation when the applied electromagnetic… …   Wikipedia

  • technology, history of — Introduction       the development over time of systematic techniques for making and doing things. The term technology, a combination of the Greek technē, “art, craft,” with logos, “word, speech,” meant in Greece a discourse on the arts, both… …   Universalium

  • Taxation history of the United States — The history of taxation in the United States began when it was composed of colonies ruled by the British Empire, French Empire, and Spanish Empire. After independence from Europe the United States collected poll taxes, tariffs, and excise taxes.… …   Wikipedia

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