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Topic: Moment (physics)

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In the News (Sat 16 Feb 19)

The nuclear fusion of two protons is a very important topic in physics, because, in the context of hot fusion, it is deemed to be the energy source that powers the sun and because, in the context of cold fusion, certain experiments offer promise in the quest for a new pollution-free energy source.
To derive with such accuracy both this hydrogen/deuteron abundance ratio and the magnetic moment of the deuteron from the same physical account of the structure of the deuteron is quite remarkable.
Given the exceptional nature of those results for the physical theory under discussion, there can surely be no doubt that the basis on which the theory is developed is correct and warrants attention in the onward quest to generate power by harnessing cold fusion technology.
www.aspden.org   (6065 words)

  Moment (physics) Encyclopedia
In physics, the moment of force (often just moment, though there are other quantities of that name such as moment of inertia) is a quantity that represents the magnitude of force applied to a rotational system at a distance from the axis of rotation.
The SI unit for moment is the newton meter (Nm).
The principle of moments is derived from Archimedes' discovery of the operating principle of the lever.
www.hallencyclopedia.com /topic/Moment_(physics).html   (486 words)

 AllRefer.com - moment (Physics) - Encyclopedia
moment, in physics and engineering, term designating the product of a quantity and a distance (or some power of the distance) to some point associated with that quantity.
The principle of the moment of a force is perhaps best seen in the use of a lever.
The moment of inertia of a body about a point is the sum, for each particle in the body, of the mass of the particle and the square of its distance from the point.
reference.allrefer.com /encyclopedia/M/moment.html   (339 words)

 CBC News In Depth: Science
Able to detect the presence of particles at a scale of 10 to the power of –17 centimetres, the LHC itself is enormous: the pipes are contained in a 27-kilometre circumference tunnel buried underground near Geneva and the Franco-Swiss border.
The Standard Model of particle physics explains the interactions of matter with three of the four fundamental forces of nature: electromagnetism, the strong nuclear force (which binds the parts of an nucleus together) and the weak nuclear force (which allows for the radioactive decay of particles).
But particle physics has so far proved as elusive to the public as the particles are to the scientists, and a large part of the reason for the confusion and disinterest is the mixed message of competing theories.
www.cbc.ca /news/background/science/lhc.html   (2612 words)

 Moment of Inertia
Moment of inertia is the name given to rotational inertia, the rotational analog of mass for linear motion.
The moment of inertia of a point mass with respect to an axis is defined as the product of the mass times the distance from the axis squared.
Since the moment of inertia of an ordinary object involves a continuous distribution of mass at a continually varying distance from any rotation axis, the calculation of moments of inertia generally involves calculus, the discipline of mathematics which can handle such continuous variables.
hyperphysics.phy-astr.gsu.edu /hbase/mi.html   (419 words)

 Jiskha Homework Help - Features: Forum: Moment/Physics
I understand a moment is a weight being moved by a particular distance.
"Moment" or "torque" is a measure of the strength or ability of a force to rotate something about an axis.
The only part of the force that matters when computing moment is the component perpendicular to the line between the force application point and the axis of rotation.
www.jiskha.com /display.cgi?id=1168326208   (205 words)

 stopphysics || about stopphysics
In the process of defining his own motivations for creating images, he also investigated the nature of the photographic process, and found that the language of photography did not describe his methods.
Phrases like "photo shoot" and "capturing a moment" both denote an invade-and-conquer mentality that he did not see reflected in the work of great photographers such as Dorthea Lange, Steve McCurry, Doris Ulman, or Arthur Fellig.
Rather, Cartier-Bresson's "decisive moment" and Ansel Adams' commitment to innovation led him on the conceptual path to practicing "stopphysics".
www.stopphysics.com /about.php   (343 words)

 Winners of the Nobel Prize in Physics
for his theoretical studies of the physical processes of importance to the structure and evolution of the stars.
for his decisive contributions to elementary particle physics, in particular the discovery of a large number of resonance states, made possible through his development of the technique of using hydrogen bubble chamber and data analysis.
for his investigations of the physics of the upper atmosphere especially for the discovery of the so-called Appleton layer.
almaz.com /nobel/physics/physics.html   (2007 words)

 Physics 2010 Moment of Inertia Experiment 4
The moment of inertia I of a body is a measure of how hard it is to get it rotating about some axis.
The moment I is to rotation as mass m is to translation.
The moment of inertia is always defined with reference to a particular axis of rotation — often a symmetry axis, but it can be any axis, even one that is outside the body.
www.colorado.edu /physics/phys2010/phys2010LabMan2000/2010labhtml/Lab4/EXP4LAB99.html   (1549 words)

 AcademicDB - Physics University Essays, Coursework and Dissertations
Determination of moment of inertia of a uniform rectangular bar and a connecting rod using the trifilar suspension, and by swinging the connecting rod as a compound pendulum.
Introduction : Moment of Inertia can be described as a measure of "unwillingness to change the current motion" of a certain body of mass.
By using the equation 1 the moment of inertia of...
www.academicdb.com /Physics   (3241 words)

 Quantum physics says goodbye to reality (April 2007) - News - PhysicsWeb
Quantum mechanics says that there should be a high correlation between results at the polarizers because the photons instantaneously "decide" together which polarization to assume at the moment of measurement, even though they are separated in space.
Hidden variables, however, says that such instantaneous decisions are not necessary, because the same strong correlation could be achieved if the photons were somehow informed of the orientation of the polarizers beforehand.
They found that, just as in the realizations of Bell's thought experiment, Leggett's inequality is violated – thus stressing the quantum-mechanical assertion that reality does not exist when we're not observing it.
physicsweb.org /articles/news/11/4/14   (612 words)

 Torque Summary
The rotational analogues of force, mass, and acceleration are torque, moment of inertia, and angular acceleration respectively.
The force applied to a lever, multiplied by its distance from the lever's fulcrum, is the torque.
The construction of the "moment arm" is shown in the figure below, along with the vectors r and F mentioned above.
www.bookrags.com /Torque   (1715 words)

 Rigid Body Collisions - Physics Simulation
Moment of inertia is the equivalent of mass for rotational physics.
Physically Based Modeling is a set of course notes from Siggraph '97 by Andrew Witkin and David Baraff.
Physics For Game Developers by David M. Bourg (O'Reilly Press) has a section on linear and angular impulse on page 95, and resting contact forces on page 258.
www.myphysicslab.com /collision.html   (2985 words)

 [No title]   (Site not responding. Last check: )
Effects of superfluidity including the existence of quantized vortices and the reduction of the moment of inertia are discussed, as well as the consequences of coherence such as the Josephson effect and interference phenomena.
Molecular theory has to link these moments to the experimentally measured quantities, such as frequency shifts, etc. The other possible sources of the parity non-conservation in molecules are the electron-nuclear neutral current interactions and the electric-dipole moment of the electron.
The physical interpretation of the susceptibility due to atomic ionization in an optical field is discussed.
physics.unr.edu /~tap/BibTeX/all.bib   (8502 words)

 American Scientist Online - g -OLOGY   (Site not responding. Last check: )
In some of these states the electron's intrinsic magnetic moment is oriented parallel to the external magnetic field, and in other states it is antiparallel.
After all, the theorist can leave behind all the messy imperfections of the physical world and operate in an abstract realm where vacuums and magnetic fields are always ideal, and no one ever spills coffee on the control panel.
The anomalous magnetic moment of the muon: A theoretical introduction.
www.americanscientist.org /template/AssetDetail/assetid/32262/page/1?&print=yes   (3762 words)

 David W. Hertzog, The Department of Physics at the University of Illinois at Urbana-Champaign
The Department of Physics at the University of Illinois at Urbana-Champaign
Professor Hertzog received his bachelor's degree in physics from Wittenberg University in 1977, and his Ph.D. in physics from the College of William and Mary in 1983.
Measurement of the negative muon anomalous magnetic moment to 0.7 ppm.
www.physics.uiuc.edu /people/Hertzog   (665 words)

 Orbital Magnetic Moment   (Site not responding. Last check: )
The magnetic moment associated with an electron orbit is given by
A unit of magnetic moment called the "Bohr magneton" is introduced here.
The z-component of the magnetic moment is given by
hyperphysics.phy-astr.gsu.edu /hbase/quantum/orbmag.html   (83 words)

 the big daddies
in physics, we had our own little corner in the back of the class where we caused a lot of commotion.
eh anyways, he was also in my physics study group, although we didn't get much done.
anyways, in physics, he use to be in the back with adnan and me but then he got into trouble and was sent into the front of the class.
www.angelfire.com /weird2/nhillydilly/bigdaddies   (585 words)

 What is a dipole moment?
where p is the moment created by the charges separated by a distance d.
The dipole moment would be pole strength times pole separation.
A dipole is the limiting case of this, as d goes to zero and q goes to infinity but qd remains finite.
www.physicsforums.com /showthread.php?threadid=156215   (489 words)

 WORTHPLAYING - - All about games !
Our game is not a simulator, but even vehicles behave according to laws of physics: a turn of tank on the place is accompanied with inertia; a flat tire of a car will make it give down on the specified point; if a car looses its wheel on the run, the car can turn down.
Like AI system the system of physics was a part of the GEM engine and was developed together with it and with the game.
All of them can be exposed to physical effect and all of them have corresponding parameters of materials they consist of, i.e.
www.worthplaying.com /article.php?sid=31256   (1853 words)

 Molecular dipole moment??? Text - Physics Forums Library
02-11-2004, 11:52 AM A dipole moment is created when there is a difference in electronegativity between the bonded atoms.
Thus, electrons from one atom is attracted closer to the other causing one atom to become \delta+ and the other \delta-.
These are in order of strongest weakest, and the H bonding is only 5% as stong as an acutal bond.
www.physicsforums.com /archive/index.php/t-14245.html   (588 words)

 Precession of a Gyroscope and Precession of the Earth's Axis
M is the 'moment' meaning the sideways (along axis 2) moment (or torque) that is trying to change the direction of the horizontal (originally along axis 1) angular momentum vector of the spinning rotor (in other words, the fact that gravity is attempting ot make it fall, and therefore hinge around axis 2).
I is something called the 'moment of inertia', a characteristic of the construction of the spinning rotor, omega (w here) is the rate of spinning of the rotor, and OMEGA (W here) is the rate of precession that will occur.
Moment or Torque is force times radius arm, so we have the torque as being 0.294 newton times half of the shaft length or 0.04 meter for a torque of 0.01076 newton-meter.
mb-soft.com /public/precess.html   (7872 words)

 Columbia Encyclopedia- moment - AOL Research & Learn
The most theoretically useful moments are moments of masses, areas, lines, and forces, including magnetic force.
The principle of the moment of a force is perhaps best seen in the use of a lever.
The moment of inertia of a body about a point is the sum, for each particle in the body, of the mass of the particle and the square of its distance from the point.
reference.aol.com /columbia/_a/moment/20051206221709990018   (288 words)

 moment - HighBeam Encyclopedia
MOMENT 'BOMBER' FLED IN A BURKA ; Clutching handbag, 21/7 suspect caught on CCTV
A US soldier shares a moment with an Iraqi boy during a patrol...
An Orwellian moment: the myth of American multilateralism: Bruce Harding reflects on the state of US foreign policy, in terms of its self-interest and imperial anchoring, as this relates to the current administration's new security strategy and the War on Terror.
www.encyclopedia.com /doc/1E1-moment.html   (665 words)

 [physics/0701128] Moment distributiuons of clusters and molecules in the adiabatic rotor model
Moment distributiuons of clusters and molecules in the adiabatic rotor model
The theory is the same for magnetic and electric dipole moments, and is based on a thermal ensemble of classical particles that are free to rotate and that have moment vectors aligned along a principal axis of rotation.
The theory has two parameters, the ratio of the magnetic (or electric) dipole energy to the thermal energy, and the ratio of moments of inertia of the rotor.
arxiv.org /abs/physics/0701128   (146 words)

 Syvum Physics Quiz : Stability & Moments
is defined as the product of the force and the moment arm, where the moment arm is the shortest distance from a point to the line of action of the force.
The SI unit of moment is N m.
The moment of a force is directly proportional to the turning effect of the force.
www.syvum.com /cgi/online/mult.cgi/squizzes/physics/stability_moments.html   (270 words)

 What is Quantum Physics?
While Newtonian physics can suitably describe the orbit of the planets or the energy transformations during a game of pool, quantum physics describes how electrons surround the nucleus of the atom and other subatomic actions.
The difference is that the common laws of physics begin to deteriorate on small scales.
What quantum physics does is give us the statistical probability of the electron's location at any one moment.
www.jracademy.com /~jtucek/science/what.html   (543 words)

 Physics News - Topix
News on Physics continually updated from thousands of sources around the net.
When I went to law school, I had the sense that we all pretty much knew what the role of lawyers was.
One of the greatest unsolved problems in condensed matter physics is explaining how electrons pair up in the copper-oxide materials that superconduct at temperatures above 100 K. Some theorists believe that the...
www.topix.net /science/physics   (741 words)

 The Open Door Web Site : IB Physics : The Moment of a Force
The moment of a force is a measure of its
Therefore, the moment of the force is given by
Moment = Fr and it is clear that this is the maximum value of the turning effect for a given force.
www.saburchill.com /physics/chapters/0018.html   (180 words)

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