... Newton's Laws . ... Mass . ... The most familiar force is weight, the downward force on an object due to gravity. ... In the absence of opposing forces, if a force does act on an object at rest or moving at constant speed, it accelerates in the direction of the force. ... By Newton's second law, the acceleration a of an object is proportional to the force F acting on it and inversely proportional to its mass m. Expressing F in newtons we now get a --for any acceleration, not just for free fall--as ....

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• Frames of Reference: The Basics
• Newton's 3rd Law
• Motion in a Circle

Isaac Newton on the British pound note . ... 1) In the absence of forces, a body at rest will stay at rest, and a body moving at a constant velocity in a straight line continues doing so indefinitely. 2) When a force is applied to an object ("body"), it accelerates in the direction of the force. ... The second law gives an explicit formula, and hence is the one most useful. ... Mach argued that Newton's laws boil down to one law: . ... Mass and force are now readily derived. ...

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• Frames of Reference: The Basics

... By the time Isaac Newton entered college, the scientific revolution of the 17th century was well underway. ... Men like Copernicus, Kepler, Galileo, and Descartes had all helped develop a new view of nature. ... Plato is my friend, Aristotle is my friend, but my best friend is truth." ... Isaac Newton was born on Christmas Day, 1642, the same year Galileo died. ... He was one of the most creative geniuses the world has ever seen and to many people the greatest scientist who ever lived. ...

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• http://zebu.uoregon.edu/disted/ph121/l3.html
• http://zebu.uoregon.edu/tandf/errors.html
• Historical Cosmologies

. Previous slide . Next slide . Back to first slide . View graphic version .

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• The High-Z SN Search Description

The VIRGO project is a physics experiment; its aim is the detection of gravitational waves. ... It has not yet been possible to detect directly the gravitational waves: it remains one of the major challenges of experimental physics. ... Interferometric antennas for gravitational waves Gravitational waves distort space-time: along two perpendicular directions, the distances between fixed points will increase (resp. decrease), at the arrival of a gravitational wave. ... Publications from our Group . ...

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... Binary orbits in the acceleration/period plane . Circular Orbits . ... We first present the equations for the period and acceleration of a pulsar in an eccentric binary system as a function of its position in the orbit. ... In Freire, Kramer & Lyne (2001) (from where most of this text and following equations are taken), we describe in more detail how circular binary orbits can be determined from the observed periods and accelerations of the pulsar. ... where is the orbital period of the binary. ...

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• Cosmology / Relativity / Gravity Wave Astronomy
• alfa C0,1az,3z cor. oct11
• rfi_az_dependence

... In spite of the fact that the orbit assumes a zero gravity (the scientists count on it by growing super-clean crystals and other materials impossible on the earth), in fact, none spacecraft provides such conditions. ... This question is answered by the device developed by SSAU scientists - Micro-acceleration Compensation Space System (MCSS). ... Then, the computer will give commands to the magnets that compensate micro-accelerations. ... Tags: 'photon-m4' mcss . ... SAMARA STATE AEROSPACE UNIVERSITY...

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... Measurements of recent changes in the expansion rate via supernovae , published by myself in 1998with the High-z Team ( Riess et al. 1998 ) and the Supernova Cosmology Project in 1999, first revealed that the expansion of the Universe is now accelerating.€а At the time , the High-z Team began (Schmidt et al. 1998) the Universe was expected to be decelerating under the gravitational braking applied by its own mass, so this finding was an enormous surprise ...

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• Dr. Adam Riess - Research
• Rodger Doxsey - How HST Works
• Administrative Newsletter

... solar system . ... IBEX measures changes in the direction of interstellar winds buffeting our solar system . ... The solar system moves through a local galactic cloud at a speed of 50,000 mph, driving an interstellar wind of particles, which can be measured by Earth-orbiting or interplanetary spacecraft. ... Data from NASA's Interstellar Boundary Explorer (IBEX) spacecraft reveal that neutral interstellar atoms are flowing into the solar system from a different direction than previously observed. ...

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• Is cosmic acceleration changing? | Astronomy.com
• Dark energy and the accelerating universe | Astronomy.com
• Measuring gravity's pull at the surface of distant stars | Astronomy.com

... Bad Astronomy . ... Mad Science . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. ... Bubbles as in the bubbles found in soda, soft drinks, all flow upwards,when shaken .Is it possible that it would ever flow downwards? ... They "know" which way down is because that is the way gravity pulls them, and they tend to flow away from that direction. ... It is the acceleration of gravity that the bubbles feel, and they flow in the other direction. ... 2008 Phil Plait. ...

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• Phil Plait's Bad Astronomy: Bad News
• Phil Plait's Bad Astronomy: Misconceptions
• Phil Plait's Bad Astronomy: Misconceptions: Planet X and Orbital Math

In order to measure the density of the Universe, it is necessary to sample a region that is larger than the scale on which the Universe becomes approximately homogeneous. ... When applied to clusters of galaxies we find a mass to luminosity ratio that implies a density of the Universe that is about 0.3 times the critical density. ... Thus the mass-to-muinosity ratio appears to vary with the size of the region measured, from 3 in the solar neighborhood to 30 in galaxies to 300 in clusters of galaxies. ...

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• Relativity Tutorial
• The Modified Gauss--Newton Method.
• Space-Time with Bound Cluster

... Fit the ring around the equator and then change its inclination from 0 degrees (equatorial orbit used by geosynchronous satellites) to 28.5 degrees (space shuttle orbit) to 51.6 degrees (space station orbit) to 90 degrees (polar orbit used by spy satellites). by Rob Landis, Space Telescope Science Institute . ... With so many satellites now in orbit, it is likely that you have seen an artificial satellite zipping across the night sky. ... http://www.amsat.org/amsat/ftpsoft.html . ...

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• ASP: Mercury Summer 2011
• ASP: The Biggest Bang of Them All
• ASP: Classroom Activity: Playground Physics

... Accelerating black holes, spin-2/3fields and C-metric . A TOPOLOGICAL EXTENSION OF GENERAL RELATIVITY TO EXPLORE THE NATURE OF QUANTUM SPACETIME, DARK ENERGY AND INFLATION . EFFECTIVE THEORY FOR QUANTUM GRAVITY . TESTS OF GENERAL RELATIVITY AND ALTERNATIVE THEORIES OF GRAVITY USING GRAVITATIONAL WAVE OBSERVATIONS . ... THE MASS OF THE OPPENHEIMER-SNYDER-BLACK HOLE: ONLY FINITE MASS QUASI-BLACK HOLES . ... NEUTRINO MASS AND THE STANDARD MODEL . Neutrino masses and flavor mixing . ...

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... To access the measures do the following. ... Each of them can be either a scalar quantity with a scalar or vector for its actual value (see the following example):: from pyrap.quanta import quantity dm.epoch('utc','today') # note that your value will be different {'m0': {'unit': 'd', ' value ': 55147.912709756973}, 'refer': 'UTC', 'type': 'epoch'} dm.direction(' j2000 ','5h20m','-30.2deg') {'m0': {'unit': ' rad ', ' value ': 1.3962634015954634}, 'm1': {'unit': ' ...

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• ATNF Media Release - December 1, 1998
• casacore: measures/Measures/MeasComet.h Source File
• casacore: measures/Measures/MCuvw.h Source File

. The XMM-Newton website has moved to the following location: . http://www.cosmos.esa.int/web/xmm-newton

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• Correction of the energy scale in specific pixels
• satvelsrc: SATellite VELocity in SouRCe direction

... 8, ``Celestial Mechanics'', 2002 Generalized Nordtvedt effect and tests of equivalence principle for rotating bodies Yu. ... To study theoretical predictions for possible violation of EEP the Thirring­Feynman field gravity theory (FGT) is considered [3], [4]. ... Using Lagrangian formalism of the relativistic field theory the post­Newtonian equation of translational motion for rotating bodies is derived in the frame of FGT. ... Thirring W. Field--theoretical approach to gravitation. ...

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• Keywords_340
• Keywords_129

Papers by Bruno Leibundgut published in 1998 . SN 1996N - A type Ib supernova at late phases, . ... Observational Evidence from Supernovae for an Accelerating Universe . ... The High-z Supernova Search: Measuring Cosmic Deceleration and . Global Curvature of the Universe Using Type Ia Supernova, . ... ApJ, 507, 46 . ... Cosmic Deceleration measured with Type Ia Supernovae, . ... Type Ia Supernovae and q0, . ... in Supernovae and Cosmology, eds. L. Labhardt, B. Binggeli, R. Buser, . ...

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• A fine-tooth comb to measure the accelerating universe | ESO
• A fine-tooth comb to measure the accelerating universe | ESO Ireland
• A fine-tooth comb to measure the accelerating universe | ESO United States

THE STUDY OF THE PIONEER ANOMALY THE STUDY OF THE PIONEER ANOMALY The Pioneer Anomaly : Effect, New Data and New Investigation Slava G. Turyshev Jet Propulsion Laboratory, California Institute of Technology Seminar at the Sternberg Astronomical Institute Moscow State University, Moscow, 6 February 2007 1 THE STUDY OF THE PIONEER ANOMALY THE STUDY OF THE PIONEER ... Are they relevant to the Pioneer anomaly? ...

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• Trudy GAISH, vol. LXV, 1996, Abstracts in English

. Planetary Approach . "Final Stage of the Hohmann Transfer" . Previous . Main . Next .

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• MASSES
• Abstract
• Atmospheres

The database contains references to the papers, data files and links to the Internet resources related to measurements and calculations of the optical constants in the wavelength interval from X-rays to radio domain. ... References to some useful books and reviews on the subject (e.g. the classical handbooks edited by E.D.Palik) and links to Internet collections of optical constants and personal WWW pages with related software were also placed in the database. You have arrived at our welcome page. ...

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• Optical constant database - Level: measurement/paper
• Gravity Theory
• Database of Optical Properties -- Level: subsubpage