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ellipsoidal | A Wisdom Archive on ellipsoidal | | ellipsoidal A selection of articles related to ellipsoidal | |
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ellipsoidal
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ARTICLES RELATED TO ellipsoidal | |
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| | |  ellipsoidal: Encyclopedia II - Sling weapon - The sling in antiquity
Sling weapon - Origins.
The sling is an ancient weapon, the origin of which is lost in antiquity. It is certain that slings were known to Neolithic peoples around the Mediterranean, but it seems likely that the sling is very much older. With the exception of Australia, the sling became common all over the world, although it is not clear whether this occurred because of cultural diffusion or independent invention.See also: Sling weapon, Sling weapon - The sling in antiquity, Sling weapon - Origins, Sling weapon - Archaeology, Sling weapon - Ancient representations, Sling weapon - Written history, Sling weapon - Combat, Sling weapon - Construction, Sling weapon - Ammunition, Sling weapon - The sling in medieval period, Sling weapon - Europe, Sling weapon - The Americas, Sling weapon - Variants, Sling weapon - Staff sling, Sling weapon - Kestrosphendone, Sling weapon - Catapults, Sling weapon - Slings today, Sling weapon - Slings of tomorrow, Sling weapon - How to sling Read more here: » Sling weapon: Encyclopedia II - Sling weapon - The sling in antiquity |
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| | | | ellipsoidal: Encyclopedia II - Black hole - Evidence
Black hole - Formation.
General relativity (as well as most other metric theories of gravity) not only says that black holes can exist, but in fact predicts that they will be formed in nature whenever a sufficient amount of mass gets packed in a given region of space, through a process called gravitational collapse. For example, if you compressed the Sun to a radius of three kilometers, about four millionths of its present size, it would become a black hole. As the mass inside the given region of space inc ...
See also:Black hole, Black hole - History, Black hole - Evidence, Black hole - Formation, Black hole - Observation, Black hole - Have we found them?, Black hole - Recent discoveries, Black hole - Features and issues, Black hole - The event horizon, Black hole - The singularity, Black hole - Entering a black hole, Black hole - Rotating black holes, Black hole - Entropy and Hawking radiation, Black hole - Black hole unitarity, Black hole - Mathematical theory, Black hole - Alternative models Read more here: » Black hole: Encyclopedia II - Black hole - Evidence |
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| | | | ellipsoidal: Encyclopedia II - Football - The establishment of modern codes of football
Football - English public schools.
The earliest evidence that games resembling football were being played at English public schools — attended by boys from the upper, upper-middle and professional classes — comes from the Vulgaria by William Horman in 1519. Horman had been headmaster at Eton College and Winchester and his Latin textbook includes a translation exercise with the phrase "We wyll playe with a ball full of wynde". The first specific mention of football can be found in a Latin poem by Robert ...
See also:Football, Football - History, Football - Ancient games, Football - Mediæval football, Football - Calcio Fiorentino, Football - Official disapproval and attempts to ban football, Football - The establishment of modern codes of football, Football - English public schools, Football - The Cambridge Rules, Football - Other developments in the 1850s, Football - Australian Rules football, Football - The Football Association, Football - Rugby football, Football - North American football, Football - Gaelic football, Football - The split in rugby football, Football - The reform of American football, Football - The two rugby codes diverge further, Football - Football today, Football - Use of the word football in English-speaking countries, Football - Games descended from the FA rules of 1863, Football - Games descended from Rugby School rules, Football - Irish and Australian varieties of football, Football - Surviving Mediæval ball games, Football - Other surviving public school games, Football - More recent inventions and derivations, Football - Tabletop games and other recreations Read more here: » Football: Encyclopedia II - Football - The establishment of modern codes of football |
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| | | | ellipsoidal: Encyclopedia II - Sling weapon - Variants
Sling weapon - Staff sling.
The staff sling, also known as the stave sling, consists of a stave (a length of wood) with a short sling at one end. One cord of the sling is firmly attached to the stave and the other end has a loop that can slide off and release the projectile. Staff slings are extremely powerful because the stave can be made as long as two meters, creating a powerful lever. Ancient art shows slingers holding staff slings by one end, with the pocket behind them, and using both hands to t ...
See also:Sling weapon, Sling weapon - The sling in antiquity, Sling weapon - Origins, Sling weapon - Archaeology, Sling weapon - Ancient representations, Sling weapon - Written history, Sling weapon - Combat, Sling weapon - Construction, Sling weapon - Ammunition, Sling weapon - The sling in medieval period, Sling weapon - Europe, Sling weapon - The Americas, Sling weapon - Variants, Sling weapon - Staff sling, Sling weapon - Kestrosphendone, Sling weapon - Catapults, Sling weapon - Slings today, Sling weapon - Slings of tomorrow, Sling weapon - How to sling Read more here: » Sling weapon: Encyclopedia II - Sling weapon - Variants |
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| | | | ellipsoidal: Encyclopedia II - Sling weapon - How to sling For a conventional throw, one does not make multiple rotations of the sling, a proper slinging action requires just one rapid rotation. The more times you swing it, the less likely you'll hit anything.
(Some slingers will rotate the sling slowly once or twice to seat the projectile in the cradle.)
One makes an overhand throw, using the sling to extend one's arm. The motion is similar to bowling a cricket ball. This is relatively accurate, instinctive and quite powerful. One faces 60 degrees away from the target, with one ...
See also:Sling weapon, Sling weapon - The sling in antiquity, Sling weapon - Origins, Sling weapon - Archaeology, Sling weapon - Ancient representations, Sling weapon - Written history, Sling weapon - Combat, Sling weapon - Construction, Sling weapon - Ammunition, Sling weapon - The sling in medieval period, Sling weapon - Europe, Sling weapon - The Americas, Sling weapon - Variants, Sling weapon - Staff sling, Sling weapon - Kestrosphendone, Sling weapon - Catapults, Sling weapon - Slings today, Sling weapon - Slings of tomorrow, Sling weapon - How to sling Read more here: » Sling weapon: Encyclopedia II - Sling weapon - How to sling |
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| | | | ellipsoidal: Encyclopedia II - Football - History Throughout the history of mankind the urge to kick at stones and other such objects is thought to have led to many early activities involving kicking and/or running with a ball. Football-like games predate recorded history in all parts of the world, though the earliest forms of football are not known.
Football - Ancient games.
Documented evidence of what is possibly the oldest organized activity resembling football can be found in a Chinese military manual written during the ...
See also:Football, Football - History, Football - Ancient games, Football - Mediæval football, Football - Calcio Fiorentino, Football - Official disapproval and attempts to ban football, Football - The establishment of modern codes of football, Football - English public schools, Football - The Cambridge Rules, Football - Other developments in the 1850s, Football - Australian Rules football, Football - The Football Association, Football - Rugby football, Football - North American football, Football - Gaelic football, Football - The split in rugby football, Football - The reform of American football, Football - The two rugby codes diverge further, Football - Football today, Football - Use of the word football in English-speaking countries, Football - Games descended from the FA rules of 1863, Football - Games descended from Rugby School rules, Football - Irish and Australian varieties of football, Football - Surviving Mediæval ball games, Football - Other surviving public school games, Football - More recent inventions and derivations, Football - Tabletop games and other recreations Read more here: » Football: Encyclopedia II - Football - History |
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| | | | ellipsoidal: Encyclopedia II - HD 209458 b - Detection of the atmosphere On November 27, 2001 the Hubble Space Telescope detected sodium in the planet's atmosphere, the first planetary atmosphere outside our solar system to be measured. In 2003/4 Astronomers used the Hubble Space Telescope Imaging Spectrograph to discover an enormous ellipsoidal envelope of hydrogen, carbon and oxygen around the planet that reaches 10,000°C. At this temperature, the Boltzmann distribution of particle velocities gives rise to a significant 'tail' of atoms moving at speeds greater than the escape velocity, and the planet is estima ...
See also:HD 209458 b, HD 209458 b - Discovery, HD 209458 b - Physical parameters, HD 209458 b - Detection of the atmosphere, HD 209458 b - Direct detection Read more here: » HD 209458 b: Encyclopedia II - HD 209458 b - Detection of the atmosphere |
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| | | | ellipsoidal: Encyclopedia II - Sling weapon - Slings today The sling is used today as a weapon primarily by violent protestors, launching either stones or incendiary devices, such as Molotov cocktails. The Finns made use of sling launched Molotov cocktails in the Winter War against Soviet tanks.
The sling is of interest to athletes interested in, for example, breaking distance records. The best modern material is a polyester twine (trade name Dacron). Dacron is stron ...
See also:Sling weapon, Sling weapon - The sling in antiquity, Sling weapon - Origins, Sling weapon - Archaeology, Sling weapon - Ancient representations, Sling weapon - Written history, Sling weapon - Combat, Sling weapon - Construction, Sling weapon - Ammunition, Sling weapon - The sling in medieval period, Sling weapon - Europe, Sling weapon - The Americas, Sling weapon - Variants, Sling weapon - Staff sling, Sling weapon - Kestrosphendone, Sling weapon - Catapults, Sling weapon - Slings today, Sling weapon - Slings of tomorrow, Sling weapon - How to sling Read more here: » Sling weapon: Encyclopedia II - Sling weapon - Slings today |
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| | | | ellipsoidal: Encyclopedia II - Sling weapon - The sling in medieval period
Sling weapon - Europe.
By the middle ages the shepherd's sling was militarily extinct. The Staff sling continued to be used in sieges and the sling was used as a part of large siege engines.
The sling continued in use for the hunting of game.
Sling weapon - The Americas.
The sling was known throughout the Americas. [7]
In the ancient Andean civilizations such as Inca Empire slings were made from the wool of the Llama. These slings typically have a cradle that is l ...
See also:Sling weapon, Sling weapon - The sling in antiquity, Sling weapon - Origins, Sling weapon - Archaeology, Sling weapon - Ancient representations, Sling weapon - Written history, Sling weapon - Combat, Sling weapon - Construction, Sling weapon - Ammunition, Sling weapon - The sling in medieval period, Sling weapon - Europe, Sling weapon - The Americas, Sling weapon - Variants, Sling weapon - Staff sling, Sling weapon - Kestrosphendone, Sling weapon - Catapults, Sling weapon - Slings today, Sling weapon - Slings of tomorrow, Sling weapon - How to sling Read more here: » Sling weapon: Encyclopedia II - Sling weapon - The sling in medieval period |
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| | | | ellipsoidal: Encyclopedia II - Black hole - Mathematical theory Black holes are predictions of Albert Einstein's theory of general relativity. In particular, they occur in the Schwarzschild metric, one of the earliest and simplest solutions to Einstein's equations, found by Karl Schwarzschild in 1915. This solution describes the curvature of spacetime in the vicinity of a static and spherically symmetric object, where the metric is
,
where is a standard element of solid angle.
According to Schwarzschild's solution, a gravitating object will collapse into a black hole if ...
See also:Black hole, Black hole - History, Black hole - Evidence, Black hole - Formation, Black hole - Observation, Black hole - Have we found them?, Black hole - Recent discoveries, Black hole - Features and issues, Black hole - The event horizon, Black hole - The singularity, Black hole - Entering a black hole, Black hole - Rotating black holes, Black hole - Entropy and Hawking radiation, Black hole - Black hole unitarity, Black hole - Mathematical theory, Black hole - Alternative models Read more here: » Black hole: Encyclopedia II - Black hole - Mathematical theory |
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| | | | ellipsoidal: Encyclopedia II - Black hole - Features and issues Black holes require the general relativistic concept of a curved spacetime: their most striking properties rely on a distortion of the geometry of the space surrounding them.
Black hole - The event horizon.
The "surface" of a black hole is the so-called event horizon, an imaginary surface surrounding the mass of the black hole. Stephen Hawking proved that the topology of the event horizon of a (four dimensional) black hole is a 2-sphere. At the event horizon, the escape velocity is equal to the spee ...
See also:Black hole, Black hole - History, Black hole - Evidence, Black hole - Formation, Black hole - Observation, Black hole - Have we found them?, Black hole - Recent discoveries, Black hole - Features and issues, Black hole - The event horizon, Black hole - The singularity, Black hole - Entering a black hole, Black hole - Rotating black holes, Black hole - Entropy and Hawking radiation, Black hole - Black hole unitarity, Black hole - Mathematical theory, Black hole - Alternative models Read more here: » Black hole: Encyclopedia II - Black hole - Features and issues |
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| | | | ellipsoidal: Encyclopedia II - Black hole - Alternative models Several alternate models, which behave like a black hole but avoid the singularity, are considered. But most researchers judge these concepts artificial, as they are more complicated but don't give near term observable differences from black holes (see Occam's razor). The most prominent theory is the Gravastar.
In March 2005, physicist George Chapline at the Lawrence Livermore National Laboratory in California proposed that black holes do not exist, and that objects currently thought to be black holes are actually dark-energy stars. H ...
See also:Black hole, Black hole - History, Black hole - Evidence, Black hole - Formation, Black hole - Observation, Black hole - Have we found them?, Black hole - Recent discoveries, Black hole - Features and issues, Black hole - The event horizon, Black hole - The singularity, Black hole - Entering a black hole, Black hole - Rotating black holes, Black hole - Entropy and Hawking radiation, Black hole - Black hole unitarity, Black hole - Mathematical theory, Black hole - Alternative models Read more here: » Black hole: Encyclopedia II - Black hole - Alternative models |
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| | | | ellipsoidal: Encyclopedia II - Black hole - History The concept of a body so massive that not even light could escape it was put forward by the English geologist John Michell in a 1783 paper sent to the Royal Society. At that time, the Newtonian theory of gravity and the concept of escape velocity were well known. Michell computed that a body 500 times the radius of the Sun and of the same density would have, at its surface, an escape velocity equal to the speed of light, and therefore would be invisible. In his words:
If the semi-diameter of a sphere of the same density as th ...
See also:Black hole, Black hole - History, Black hole - Evidence, Black hole - Formation, Black hole - Observation, Black hole - Have we found them?, Black hole - Recent discoveries, Black hole - Features and issues, Black hole - The event horizon, Black hole - The singularity, Black hole - Entering a black hole, Black hole - Rotating black holes, Black hole - Entropy and Hawking radiation, Black hole - Black hole unitarity, Black hole - Mathematical theory, Black hole - Alternative models Read more here: » Black hole: Encyclopedia II - Black hole - History |
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| | | | ellipsoidal: Encyclopedia II - Football - History Throughout the history of mankind the urge to kick at stones and other such objects must have inevitably led to many early activities involving kicking and/or running with a ball. Football-like games undoubtedly predate recorded history in all parts of the world and the earliest forms of football can only be guessed at.
Football - Ancient games.
Documented evidence of what is possibly the oldest organized activity resembling football can be found in a Chinese military manual written during the ...
See also:Football, Football - History, Football - Ancient games, Football - Mediæval football, Football - Calcio Fiorentino, Football - Official disapproval and attempts to ban football, Football - The establishment of modern codes of football, Football - English public schools, Football - The Cambridge Rules, Football - Other developments in the 1850s, Football - Australian Rules football, Football - The Football Association, Football - Rugby football, Football - North American football, Football - Gaelic football, Football - The split in rugby football, Football - The reform of American football, Football - The two rugby codes diverge further, Football - Football today, Football - Use of the word football in English-speaking countries, Football - Games descended from the FA rules of 1863, Football - Games descended from Rugby School rules, Football - Irish and Australian varieties of football, Football - Surviving Mediæval ball games, Football - Other surviving public school games, Football - More recent inventions and derivations, Football - Tabletop games and other recreations Read more here: » Football: Encyclopedia II - Football - History |
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| | | | ellipsoidal: Encyclopedia II - Sling weapon - Variants
Sling weapon - Staff sling.
The staff sling, also known as the stave sling, consists of a stave (a length of wood) with a short sling at one end. One cord of the sling is firmly attached to the stave and the other end has a loop can slide off and release the projectile. Staff slings are extremely powerful because the stave can be made as long as two meters, creating a powerful lever. Ancient art shows slingers holding staff slings by one end, with the pocket behind them, and using both hands to t ...
See also:Sling weapon, Sling weapon - The sling in antiquity, Sling weapon - Origins, Sling weapon - Archaeology, Sling weapon - Ancient representations, Sling weapon - Written history, Sling weapon - Combat, Sling weapon - Construction, Sling weapon - Ammunition, Sling weapon - The sling in medieval period, Sling weapon - Europe, Sling weapon - The Americas, Sling weapon - Variants, Sling weapon - Staff sling, Sling weapon - Kestrosphendone, Sling weapon - Catapults, Sling weapon - Slings today, Sling weapon - Slings of tomorrow, Sling weapon - How to sling Read more here: » Sling weapon: Encyclopedia II - Sling weapon - Variants |
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More material related to Ellipsoidal can be found here:
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