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distance modulus

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  • Distance modulus — The distance modulus is a way of expressing distances that is often used in astronomy. Contents 1 Definition 2 Different kinds of distance moduli 3 Usage 4 References …   Wikipedia

  • Modulus of continuity — In mathematical analysis, a modulus of continuity is a function used to measure quantitatively the uniform continuity of functions. So, a function admits ω as a modulus of continuity if and only if for all x and y in the domain of f. Since moduli …   Wikipedia

  • Cosmic distance ladder — * Light green boxes: Technique applicable to star forming galaxies. * Light blue boxes: Technique applicable to Population II galaxies. * Light Purple boxes: Geometric distance technique. * Light Red box: The planetary nebula luminosity function… …   Wikipedia

  • Extragalactic distance scale — The extragalactic distance scale is a series of techniques used today by astronomers to determine the distance of cosmological bodies (beyond our own galaxy) not easily obtained with traditional methods. Some procedures utilize properties of… …   Wikipedia

  • Luminosity distance — DL is defined in terms of the relationship between the absolute magnitude M and apparent magnitude m of an astronomical object.: M = m 5 (log {10}{D L} 1)!,which gives:: D L = 10^{frac{(m M)}{5}+1}where DL is measured in parsecs. For nearby… …   Wikipedia

  • Section modulus — In structural engineering, the section modulus of a beam is the ratio of a cross section s second moment of area to its greatest distance from the neutral axis.The section modulus is directly related to the strength of a corresponding beam. It is …   Wikipedia

  • shear modulus — Physics. a coefficient of elasticity of a substance, expressing the ratio between the force per unit area (shearing stress) that laterally deforms the substance and the shear (shearing strain) that is produced by this force. Also called modulus… …   Universalium

  • Specific modulus — is a materials property consisting of the elastic modulus per mass density of a material. The specific modulus is often important in aerospace applications in which maximum strength for minimum weight is required.The dimensional analysis yields… …   Wikipedia

  • section modulus — a property of a cross sectional shape, which depends on shape, and orientation. Section modulus is usually denoted S, and S = I/c, where I = moment of inertia about an axis through the centroid, and c is the distance from the centroid to the… …   Mechanics glossary

  • Draco Dwarf — Central part of Draco Dwarf by HST Observation data (J2000 epoch) Constellation …   Wikipedia

  • Defining equation (physics) — For common nomenclature of base quantities used in this article, see Physical quantity. For 4 vector modifications used in relativity, see Four vector. Very often defining equations are in the form of a constitutive equation, since parameters of… …   Wikipedia

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