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List Of Equations In Gravitation
This article summarizes equations in the theory of gravitation. Definitions Gravitational mass and inertia A common misconception occurs between centre of mass and centre of gravity. They are defined in similar ways but are not exactly the same quantity. Centre of mass is the mathematical description of placing all the mass in the region considered to one position, centre of gravity is a real physical quantity, the point of a body where the gravitational force acts. They are equal if and only if the external gravitational field is uniform. Newtonian gravitation Gravitoelectromagnetism In the weak-field and slow motion limit of general relativity, the phenomenon of gravitoelectromagnetism (in short "GEM") occurs, creating a parallel between gravitation and electromagnetism. The ''gravitational field'' is the analogue of the electric field, while the ''gravitomagnetic field'', which results from circulations of masses due to their angular momentum, is the analogue of th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Equation
In mathematics, an equation is a formula that expresses the equality of two expressions, by connecting them with the equals sign . The word ''equation'' and its cognates in other languages may have subtly different meanings; for example, in French an ''équation'' is defined as containing one or more variables, while in English, any well-formed formula consisting of two expressions related with an equals sign is an equation. ''Solving'' an equation containing variables consists of determining which values of the variables make the equality true. The variables for which the equation has to be solved are also called unknowns, and the values of the unknowns that satisfy the equality are called solutions of the equation. There are two kinds of equations: identities and conditional equations. An identity is true for all values of the variables. A conditional equation is only true for particular values of the variables. An equation is written as two expressions, connected by a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Defining Equation (physics)
In physics, defining equations are equations that define new quantities in terms of base quantities. This article uses the current SI system of units, not natural or characteristic units. Description of units and physical quantities Physical quantities and units follow the same hierarchy; ''chosen base quantities'' have ''defined base units'', from these any other ''quantities may be derived'' and have corresponding ''derived units''. Colour mixing analogy Defining quantities is analogous to mixing colours, and could be classified a similar way, although this is not standard. Primary colours are to base quantities; as secondary (or tertiary etc.) colours are to derived quantities. Mixing colours is analogous to combining quantities using mathematical operations. But colours could be for light or paint, and analogously the system of units could be one of many forms: such as SI (now most common), CGS, Gaussian, old imperial units, a specific form of natural units or even arbit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SI Units
The International System of Units, known by the international abbreviation SI in all languages and sometimes Pleonasm#Acronyms and initialisms, pleonastically as the SI system, is the modern form of the metric system and the world's most widely used system of measurement. Established and maintained by the General Conference on Weights and Measures (CGPM), it is the only system of measurement with an official status in nearly every country in the world, employed in science, technology, industry, and everyday commerce. The SI comprises a Coherence (units of measurement), coherent system of units of measurement starting with seven SI base unit, base units, which are the second (symbol s, the unit of time), metre (m, length), kilogram (kg, mass), ampere (A, electric current), kelvin (K, thermodynamic temperature), Mole (unit), mole (mol, amount of substance), and candela (cd, luminous intensity). The system can accommodate coherent units for an unlimited number of additional qua ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Physical Quantities
A physical quantity is a physical property of a material or system that can be quantified by measurement. A physical quantity can be expressed as a ''value'', which is the algebraic multiplication of a ' Numerical value ' and a ' Unit '. For example, the physical quantity of mass can be quantified as '32.3 kg ', where '32.3' is the numerical value and 'kg' is the Unit. A physical quantity possesses at least two characteristics in common. # Numerical magnitude. # Units Symbols and nomenclature International recommendations for the use of symbols for quantities are set out in ISO/IEC 80000, the IUPAP red book and the Quantities, Units and Symbols in Physical Chemistry, IUPAC green book. For example, the recommended symbol for the physical quantity ''mass'' is ''m'', and the recommended symbol for the quantity ''electric charge'' is ''Q''. Subscripts and indices Subscripts are used for two reasons, to simply attach a name to the quantity or associate it with another quanti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rita G
Rita may refer to: People * Rita (given name) * Rita (Indian singer) (born 1984) * Rita (Israeli singer) (born 1962) * Rita (Japanese singer) * Eliza Humphreys (1850–1938), wrote under the pseudonym Rita Places * Djarrit, also known as Rita, a community in the Marshall Islands * 1180 Rita, an asteroid * Rita, West Virginia * Santa Rita, California (other), several places Film, television, and theater * ''Rita'' (1959 film), a 1959 Australian television play * ''Rita'' (2009 Italian film), a 2009 Italian film * ''Rita'' (2009 Indian film), a 2009 Marathi film directed by Renuka Shahane * ''Rita'' (TV series), a Danish television show * RITA Award, an award for romantic fiction * ''Educating Rita'', a 1980 stage play by Willy Russel ** ''Educating Rita'' (film), a 1983 British film based on that play *Rita Santos, an adult mermaid on the TV series ''Mako Mermaids'' Music * ''Rita'' (opera), an 1841 opera by Gaetano Donizetti Albums * ''Rita'' (Rita Yahan-Farouz ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cambridge University Press
Cambridge University Press is the university press of the University of Cambridge. Granted letters patent by Henry VIII of England, King Henry VIII in 1534, it is the oldest university press A university press is an academic publishing house specializing in monographs and scholarly journals. Most are nonprofit organizations and an integral component of a large research university. They publish work that has been reviewed by schola ... in the world. It is also the King's Printer. Cambridge University Press is a department of the University of Cambridge and is both an academic and educational publisher. It became part of Cambridge University Press & Assessment, following a merger with Cambridge Assessment in 2021. With a global sales presence, publishing hubs, and offices in more than 40 Country, countries, it publishes over 50,000 titles by authors from over 100 countries. Its publishing includes more than 380 academic journals, monographs, reference works, school and uni ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Table Of Thermodynamic Equations
This article is a summary of common equations and quantities in thermodynamics (see thermodynamic equations for more elaboration). Definitions Many of the definitions below are also used in the thermodynamics of chemical reactions. General basic quantities General derived quantities Thermal properties of matter Thermal transfer Equations The equations in this article are classified by subject. Thermodynamic processes Kinetic theory Ideal gas Entropy * S = k_\mathrm \ln \Omega , where ''k''B is the Boltzmann constant, and Ω denotes the volume of macrostate in the phase space or otherwise called thermodynamic probability. * dS = \frac , for reversible processes only Statistical physics Below are useful results from the Maxwell–Boltzmann distribution for an ideal gas, and the implications of the Entropy quantity. The distribution is valid for atoms or molecules constituting ideal gases. Corollaries of the non-relativistic Maxwell–Boltzma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Relativistic Equations
Following is a list of the frequently occurring equations in the theory of special relativity. Postulates of Special Relativity To derive the equations of special relativity, one must start with two other #The laws of physics are invariant under transformations between inertial frames. In other words, the laws of physics will be the same whether you are testing them in a frame 'at rest', or a frame moving with a constant velocity relative to the 'rest' frame. #The speed of light in a perfect classical vacuum (c_0) is measured to be the same by all observers in inertial frames and is, moreover, finite but nonzero. This speed acts as a supremum for the speed of local transmission of information in the universe. In this context, "speed of light" really refers to the speed supremum of information transmission or of the movement of ordinary (nonnegative mass) matter, locally, as in a classical vacuum. Thus, a more accurate description would refer to c_0 rather than the speed of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Photonics Equations
This article summarizes equations used in optics, including geometric optics, physical optics, radiometry, diffraction, and interferometry. Definitions Geometric optics (luminal rays) General fundamental quantities Physical optics (EM luminal waves) There are different forms of the Poynting vector, the most common are in terms of the E and B or E and H fields. Radiometry For spectral quantities two definitions are in use to refer to the same quantity, in terms of frequency or wavelength. Equations Luminal electromagnetic waves Geometric optics Subscripts 1 and 2 refer to initial and final optical media respectively. These ratios are sometimes also used, following simply from other definitions of refractive index, wave phase velocity, and the luminal speed equation: \frac = \frac = \frac = \sqrt \,\! where: *''ε'' = permittivity of medium, *''μ'' = permeability of medium, *''λ'' = wavelength of light in medium, *''v'' = speed of light in media. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Equations In Wave Theory
This article summarizes equations in the theory of waves. Definitions General fundamental quantities A wave can be longitudinal where the oscillations are parallel (or antiparallel) to the propagation direction, or transverse where the oscillations are perpendicular to the propagation direction. These oscillations are characterized by a periodically time-varying displacement in the parallel or perpendicular direction, and so the instantaneous velocity and acceleration are also periodic and time varying in these directions. (the apparent motion of the wave due to the successive oscillations of particles or fields about their equilibrium positions) propagates at the phase and group velocities parallel or antiparallel to the propagation direction, which is common to longitudinal and transverse waves. Below oscillatory displacement, velocity and acceleration refer to the kinematics in the oscillating directions of the wave - transverse or longitudinal (mathematical description is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Equations In Quantum Mechanics
This article summarizes equations in the theory of quantum mechanics. Wavefunctions A fundamental physical constant occurring in quantum mechanics is the Planck constant, ''h''. A common abbreviation is , also known as the ''reduced Planck constant'' or ''Dirac constant''. The general form of wavefunction for a system of particles, each with position r''i'' and z-component of spin ''sz i''. Sums are over the discrete variable ''sz'', integrals over continuous positions r. For clarity and brevity, the coordinates are collected into tuples, the indices label the particles (which cannot be done physically, but is mathematically necessary). Following are general mathematical results, used in calculations. Equations Wave–particle duality and time evolution Non-relativistic time-independent Schrödinger equation Summarized below are the various forms the Hamiltonian takes, with the corresponding Schrödinger equations and forms of wavefunction solutions. Notice in the c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Equations In Nuclear And Particle Physics
This article summarizes equations in the theory of nuclear physics and particle physics. Definitions Equations Nuclear structure Nuclear decay Nuclear scattering theory The following apply for the nuclear reaction: :''a'' + ''b'' ↔ ''R'' → ''c'' in the centre of mass frame, where ''a'' and ''b'' are the initial species about to collide, ''c'' is the final species, and ''R'' is the resonant state. Fundamental forces These equations need to be refined such that the notation is defined as has been done for the previous sets of equations. See also *Defining equation (physical chemistry) *Defining equation (physics) * List of electromagnetism equations *List of equations in classical mechanics *List of equations in quantum mechanics *List of equations in wave theory * List of photonics equations *List of relativistic equations *Relativistic wave equations In physics, specifically relativistic quantum mechanics (RQM) and its applications to particle physics ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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