... Electric Forces . 19.Motion in a Circle . ... In the absence of forces, motion in a straight line and constant velocity continues indefinitely. ... Each rotation the stone covers a distance . ... Since its velocity v equals the distance it moves in one second, one finds . ... while the actual motion brings it to some point D on the circle, whose center will be denoted by O. In the absence of forces, motion in a straight line and constant velocity continues indefinitely. ...

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• Applying Kepler's Third Law
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... Bad Astronomy . ... Every few months, one of a series of questions comes up on the USENET group sci.astro involving tides, or the rotation of the Moon, or the recession of the Moon from the Earth. ... Why the Moon's rotation period is the same as the length of time it takes to orbit the Earth (same as number 1, but phrased differently). ... But when this happens, the time it takes for the Earth to rotate once will be slowed to exactly the same time it takes for the Moon to go around the Earth once! ...

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... Listed below are questions submitted by users of "The Great Magnet, the Earth" and the answers given to them. ... In "The Exploration of the Earth's magnetosphere" on the magnetic environment of the Earth in space (a few Q duplicated here) . ... 11) Magnetic Shielding . ... 51) Can electricity be generated from the Earth's magnetic field? ... 9) Measuring Earth's magnetic field . ... 6) Reversals of the Earth's field (4 queries) . ... 42) Could generated electricity affect Earth's magnetic field? ...

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Question 1: Ice Storm Safety System (Energy) . ... Question 3: Long Jump (Projectile Motion) . ... Question 3: Washing Windows (Forces and Torques) . ... Question 1: Star and Dark Matter (Circular motion, gravity) . Question 2: Turning Aircraft (Circular motion, force components) . Question 1: Pushing a Box (Normal force, Friction) . Question 2: Ladders (Friction, Normal Forces, Torques) . ... Question 2: Driving around a banked corner (Friction, Circular motion, Normal Forces, Vectors) . ...

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... How much brighter is the Sun as viewed from the planet Mercury as compared to Earth ? ... Actually, all of these questions can be answered through a very simple mathematical relationship known as the inverse square law. ... As the distance from the Sun increases the surface area of the sphere grows by the square of the distance. ... Common sense tells us that the Sun will be brighter and the inverse square law tells us how much brighter. ... gr = 0.912 G or 91.2% gravity felt at Earth's surface. ...

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... Gravity is responsible for keeping your feet on the ground and keeping the Earth and all other planets in our Solar System in their orbits around the Sun. ... Einstein's theory of gravity, known as the theory of General Relativity. This suggested that gravity is actually the curving of the fabric of the Universe, known as 'spacetime', around objects. For instance, a very heavy star warps the space around it, causing a deep well in the fabric, and pulling in anything that comes too close. ...

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• http://www.eso.org/public/news/eso1514/kids/
• http://www.eso.org/public/news/eso1326/kids/

... Are HVCs a common feature of star forming galaxies? ... Consider the typical properties of the smallest HVCs (compact HVCs) found in HIPASS: . Distance . HI Mass . ... At 5 kpc . meager objects ~116 solar masses . ... 1.15 x 10 4 solar masses . ... Putman et al. (2003) found none to 10 7 solar masses. 2% of Sculptor to 3 x 10 6 solar masses by de Blok et al. (2001) found none. ... High velocity gas around other galaxies can be identified from maps and dynamics: . ... 2003) . ...

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• Searching the Environment around LyAlpha Absorbers

... Two years ago, the Clementine space probe snatched this picture of the Moon as lit not by direct sunlight, but by reflected sunlight from Earth. ... Out With the Tide . ... Tides occur because the gravitational force between two bodies decreases with distance. ... The imbalanced gravitational pull of the Moon causes the oceans to be slightly non-spherical, creating two high tides and two low tides. ... In return, the Moon exerts a gravitational force on the high tide, causing Earth to rotate slower....

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• ASP: Classroom Activity: Playground Physics
• ASP: Good Astronomy Activities on the WWW
• ASP: The Biggest Bang of Them All

... Stellar Evolution is driven entirely by the never ending battle between Pressure and Gravity . As imbalances are reached, the star is driven to find a new Energy source. ... Pressure and gravitational forces are equal, the star is stable and its core is sufficiently hot to fuse Hydrogen into Helium More about main sequence stars . ... The luminosity generated by the core fusion of Helium into Carbon is far greater than the shell luminosity associated with the fusion of Hydrogen into Helium. ...

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• Historical Cosmologies
• Potential Energy
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S P E C I A L R E P OR T F F 62 ROM SLOWDOWN to SPEEDUP By Adam G. Riess and Michael S. Turner Distant supernovae are revealing the crucial time when the expansion of the universe changed from deceler ating to acceler ating tion. ... Gravity keeps us grounded. ... Although Einstein's general theory of relativity allows for gravity to push as well as pull, most physicists regarded this as a purely theoretical possibility, irrelevant to the universe today. ...

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• http://www.stsci.edu/~marel/decadal/sc/313.pdf
• Comets and Conserved Physical Quantities
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... As you may know, I'm writing a book for Prentice-Hall, due in January, called Peer Instruction for Astronomy. ... I'm looking for a colleague or two willing to review/critique some of the ConcepTest questions that will be included in the book. See http://hea-www.harvard.edu/~pgreen/educ/ConcepTests.html I suspect that a significant contribution would only take you 2-3 hours. ... ConcepTests are multiple choice questions which the students pose to each other in small groups, during class. ...

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• dictionary
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• Everyday Classroom Tools: Introduction to the Threads of Inquiry

... Great oppositions. ... Proxima Centauri. ... Scientists proved that the problem of preserving the Earth's climate and the annual change of seasons can be solved by a small star, negligible mass, but similar to a main-sequence star, moving in a circular orbit around the Sun. ... Sombrero Galaxy. The Sombrero Galaxy, M104, is known as a holder of one of supermassive black holes. ... Roughly estimate the approximate mass of the supermassive black hole in the center of M104 (answer in solar masses m). ...

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• http://www.issp.ac.ru/iao/apao/2014/problems/pages03-04_ap14_t_en_b.pdf
• http://www.issp.ac.ru/iao/apao/2014/problems/pages01-02_ap14_t_en_a.pdf

otherwise stated, constants are denoted by the following symbols and may be taken to have the values below Elementary charge Speed of light in vacuum Planck constant Permeability of vacuum Permittivity of vacuum Unified atomic mass constant Rest mass of proton Rest mass of electron Boltzmann constant Avogadro constant Gravitational ... A pulse of light of frequency f is emitted from the space station towards the ship at exactly the time the ship passes the Earth in the Earth frame. ...

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• http://www.mrao.cam.ac.uk/~kjbg1/exams/2008_paper.pdf
• OptInt PmWiki : PmWiki / Mailing Lists

UFO Forum Message . Forums: . ... God and Science · SETI · Software · UFO · XEphem . ... Discussion Forums | UFO Discussion and Tracking | Post . ... Question Answered . Forum List | ... Post Message | Back to Thread Topics | ... Login to Post . ... www.astronomy.net . About Astronomy Net | Advertise on Astronomy Net | ... Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

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• GRAVITY - an Astronomy Net Blackholes2 Forum Message
• Speed Of Gravity - an Astronomy Net Gravity Forum Message
• Good Question. - an Astronomy Net Blackholes Forum Message

What happens to a star heavier than five solar masses? ... Stars about ten solar masses probably behave like our five solar mass star until they reach the end of core-helium burning. ... The Crab nebula was formed after a massive explosion ripped a star apart in 1054. ... Today, the glowing outer layers of the star are still rushing away from a tiny star in the centre. ... An incredible explosion rips through the outer layers of the star, releasing colossal amounts of energy in a supernova explosion. ...

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• Strong Gravity in the Vicinity of Supermassive Black Holes - by Eamon Scullion,
• Atmospheres
• Armagh Observatory

Canadian Paper Money] . This page will attempt to answer questions pertaining to Canadian Paper Money.  ... 4) What does the "*" beside the serial number represent? ... Following the creation Canada's central bank, the Bank of Canada introduced its first paper money issue.  ... Starting with the 1954 Bank of Canada issue, defective notes produced during the printing process were replaced by these 'replacement notes' which carried the asterisk before the serial number.  ...

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• Simple Universe
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... To answer this question, the robot spacecraft Galileo currently in orbit around Jupiter was maneuvered to image the plume site during its recent flyby of Io in August. The Earth and Moon Planetary System . ... How similar in size are the Earth and the Moon? ... Galileo Demonstrates the Telescope . ... Knowing when and where to look, many enthusiastic sky gazers have been able to spot the International Space Station (ISS) as a bright star streaking through the twilight. ...

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... Star Atlas . ... Gaseous ring around young star raises questions . ... Astronomers have detected a mysterious ring of carbon monoxide gas around the young star V1052 Cen, which is about 700 light-years away in the southern constellation Centaurus. ... This new finding raises more questions than it answers about the late stages of star and solar system formation. т??Why do turbulent motions not tear the ring apart?т?? ... Only registered members of Astronomy.com are allowed to comment on this article...

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• NASA launches mission to study Moon from crust to core | Astronomy.com

... ATNF Home . ... About ATNF overview . ... Australia Telescope Steering Committee . ... Australian Square Kilometre Array Pathfinder . Murchison Radio-astronomy Observatory . ... Parkes radio telescope . Australia Telescope Compact Array . Mopra radio telescope . ... Visiting Parkes radio telescope . Visiting Australia Telescope Compact Array . ... Parkes radio telescope webcam . ... Star A has peak emission at a wavelength of 550 nm whilst star B has peak emission at 480 nm. ...

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• Astrometry Questions
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