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2041. La Lune, vue de loin
... La lune est la gourmandise du vent du Nord ! ... Les premiers astronomes ont compris que les diff rentes formes de la lune taient chacune li es la position relative de la lune par rapport au soleil : par exemple, la pleine lune se produit toujours quand lune et soleil se font face face dans le ciel. ... Les clipses de soleil ne se produisent uniquement que si lune et soleil occupent le m me point du ciel, ce qui signifie que la lune cache le soleil, puisqu ' elle est plus proche de nous. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Fmoon.htm -- 15.0 Кб -- 22.12.2007
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2042. Rappel de Maths
... M?me si cette mati?re vous est compl?tement nouvelle vous devriez pouvoir la comprendre si vous avez suffisamment de motivation et de pers?v?rance. Nous avons pris soin d'aplanir toutes les difficult?s potentielles. --et si l'alg?bre et la trigo sont de vielles connaissances pour vous, vous trouverez ici quelques satisfactions inattendues. ... l'alg?bre . ... Pour approfondir les maths, vous pouvez consulter ".comprendre les math?matiques " "Understanding Mathematics" de Peter Alfeld. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Fmath.htm -- 5.5 Кб -- 22.12.2007
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2043. La Masse
... La force exerc?e sur le boulet de canon, son poids , est pourtant plus grande. ... Newton l'a exprim? en une formule math?matique, la 2?me loi de Newton, "du mouvement" d?crite dans une section ult?rieure. ... celui d'un ensemble de poids connus : Pour cette raison, la masse est habituellement mesur?e en kilogrammes , mais se sont en fait des unit?s de poids. ... Les astronautes ? ... Bien sur, ce n'est pas le cas dans notre propre univers, et les deux masses sont toujours trouv?es identiques. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Fmass.htm -- 12.8 Кб -- 22.12.2007
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2044. La chute des corps
... certaines convictions antiques, tous les objets ("corps"), lourds ou l?gers, tombent a la m?me vitesse. Les ?tudes de Galil?e ont suscit? un grand int?r?t, parce qu'elles s'appliquaient non seulement aux simples chutes ( telle que la chute d'une pomme d'un arbre ) mais aussi au tr?s pratique sujet de la trajectoire des boulets de canon. ... c?t? de l'autre) la vitesse est : . ... la vitesse de chute, une limite beaucoup plus petite pour quelqu'un muni d'un parachute que pour celui qui n'en a pas! ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Ffall.htm -- 20.2 Кб -- 22.12.2007
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2045. Mass--Lesson Plan #26
Lesson Plan #26 http://www.phy6.org/stargaze/Lmass.htm . A qualitative discussion of the distinction between weight and mass, followed by a description of astronaut mass measurements in a zero-g environment, conducted in 1973. ... Mass Aboard Skylab" section #17a: . ... Learn that in oscillations of a mass against an elastic spring--in the absence of gravity, or in horizontal motion--the length of the oscillation period is proportional to the square root of the mass. ... Weight causes motion. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Lmass.htm -- 14.3 Кб -- 22.12.2007
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2046. The Way Things Fall--Lesson Plan #22
An introduction to the concept of acceleration and to motion under the influence of gravity, starting with free fall and ending with motions that start out with both horizontal and vertical initial velocities. ... This lesson plan supplements: "The Way Things Fall" section #13: on disk Sfall.htm , on the web . ... Light and heavy objects fall at the same rate, as established experimentally by Galileo. ... What can you say about the acceleration of a freely falling object? ... The same way. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Lfall.htm -- 16.6 Кб -- 22.12.2007
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2047. Work
... 18c. Work . ... The concept of Work is closely related to that of energy. ... Suppose we lift a weight A of mass m a distance h (for height) from the floor to the table (Figure 1). ... That, however, is just the potential energy added to the weight! ... Energy is always preserved but--as seen in an earlier section--not always in a usable form. ... Because the trains are linked, when one goes up, the other descends, and by giving up its potential energy, it helps pull the other one upwards. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Swork.htm -- 10.4 Кб -- 22.12.2007
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2048. The Theorem of Pythagoras
... If a triangle has sides of length ( a,b,c ), with sides ( a,b ) enclosing an angle of 90 degrees ("right angle"), then . ... 100 ? ... A diagonal cut divides it into two right-angled triangles with short sides a and b , and the area of such a triangle is therefore (1/2) ab . Now look at the square on the left constructed out of four ( a,b,c ) triangles. ... As the drawing on the right shows, that area can be divided into 4 triangles like the ones before, plus a small square of side ( a? b ). ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Spyth.htm -- 8.4 Кб -- 22.12.2007
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2049. The Moon: The Distant View
... The Moon (1) . ... The monthly cycle of the moon (we won't capitalize the word here) must have mystified early humans--"waxing" from thin crescent ("new moon") to half-moon, then to a "gibbous" moon and a full one, and afterwards "waning" to a crescent again. ... Early astronomers understood the different shapes of the moon, noting that each was linked to a certain relative position between moon and Sun: for instance, full moon always occured when moon and Sun were at opposite ends of the sky. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Smoon.htm -- 16.9 Кб -- 22.12.2007
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2050. Mass
... The difference is that inertia is an inherent property of matter, while weight also depends on gravity. ... They use gravity, balancing its force on the astronaut's body against a calibrated spring or against the force of gravity on some calibrated weights. ... Using scales and the local force of gravity, one can determine gravitational mass; or else, one might dispense with gravity, like the astronauts aboard Skylab, sand measure the "inertial mass," and in principle they may differ. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Smass.htm -- 13.9 Кб -- 22.12.2007
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2051. The Way Things Fall
... Free Fall . ... Legend has it that he climbed to the top of the leaning tower of Pisa and from there dropped simultaneously heavy and light balls, noting that they hit the ground at the same time. ... This is modified by the resistance of the air, which becomes important at higher speeds and usually sets an upper limit ("terminal velocity") to the fall velocity--a much smaller limit for someone using a parachute than one falling without. ... A longer string of course extends the fall time. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Sfall.htm -- 19.8 Кб -- 22.12.2007
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2052. Gauss and the Global Magnetic Field
an error occurred while processing this directive] . ... Gauss . ... The Magnetic Sun . ... Earth's Core . ... Magnetic Reversals . ... Carl Friedrich Gauss In a 1828 meeting Humboldt suggested to the greatest German mathematician of his time, Carl Friedrich Gauss, that he ought to apply his talents to the mysteries of magnetism. ... He also knew a method used in celestial mechanics for analyzing gravity, and applied it to the description the Earth's region of magnetic forces, its "magnetic field." ...
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Ссылки http://www.cosmos.ru/mirrors/stern/earthmag/gauss.htm -- 8.7 Кб -- 22.12.2007
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2053. A Math Refresher
... Glossary . ... Astronomy index . Mechanics index . ... From Stargazers to Starships" tries to be self-contained , even in the mathematics it uses. The sections below are meant to refresh your memory about some basic ideas in algebra and trigonometry. ... M-1A) Algebra Proficiency Drill . ... M-5) Deriving Approximate Results . ... M-8) How to tell sines from cosines . M-9) Deriving sines and cosines . ... To explore math further, you may look up "Understanding Mathematics" by Peter Alfeld. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Smath.htm -- 5.5 Кб -- 22.12.2007
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2054. De Astronomos a Astronaves
... Observadores de estrellas y observadores del Sol . 1a. La Esfera Celeste . ... La Trayectoria del Sol, la Ecl ptica . ... 3a. El ngulo de los Rayos de Sol . ... 8c. Que distancia hay a la Luna?--1 . ... 9a. Girar la Tierra alrededor del Sol? . ... Las Tres Leyes de Kepler del Movimiento Planetario-- . ... Leyes de Kepler -- Gu?a para las secciones de . las leyes de Kepler, las cuales se presentan a continuaci?n. 10. ... Marcos de Referencia Giratorios en el Espacio y sobre la Tierra . ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Mmap.htm -- 16.6 Кб -- 22.12.2007
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2055. Dagli astronomi alle astronavi
... Un insieme di programmi di corsi per insegnanti. Una panoramica di questo sito e di altri due siti della stessa famiglia. ... Astronomia del moto della Terra nello spazio: . ... Il percorso del Sole, l'eclittica . ... Guida alle sezioni seguenti sulle leggi di Keplero. ... Le astronavi . ... Di speciale interesse per gli insegnanti: "Dagli astronomi..." nelle aule scolastiche . ... Dagli astronomi alle astronavi" il seguito di un precedente sito Web "L'esplorazione della magnetosfera terrestre" . ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Imap.htm -- 18.0 Кб -- 22.12.2007
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2056. El Cielo Sobre Nosotros
... Los antiguos astr nomos, especialmente los sacerdotes de Egipto y Babilonia, pa ses semides rticos, donde los cielos raramente est n nublados, estaban fascinados por el dosel tachonado de estrellas que parec a arquearse sobre sus cabezas y por el ciclo diario del Sol, el cual parece ser sobrenatural, m s all del entendimiento. ... Nosotros ahora sabemos que en los d as es que esto ocurre, el d a y la noche son muy iguales en longitud, y ese momento del a o es denominado, por tanto, " equinocio ". ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Msky.htm -- 15.6 Кб -- 22.12.2007
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2057. Il cielo sopra di noi
Mappa del sito Programma della lezione . I primi osservatori del cielo--specialmente i sacerdoti dell'Egitto e della Mesopotamia, regioni semi-desertiche dove raramente il cielo Х nuvoloso-- erano affascinati dalla volta stellata che sembrava incurvarsi sopra di loro, e dal ciclo diurno del Sole, che sembrava soprannaturale, al di l di ogni comprensione. ... Osservando giorno dopo giorno, notereste che il Sole sorge sempre approssimativamente dalla stessa direzione, che chiamerete est . ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Isky.htm -- 13.8 Кб -- 22.12.2007
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2058. Des observateurs aux explorateurs de l' espace
Revenir la liste principale Astronomie des mouvements de la terre dans l'espace: . ... Les premiers observateurs du ciel et des astres . ... Le Trajet du Soleil, l'Ecliptique . ... Des observateurs aux explorateurs de l' espace" est suivi d' un site plus recent " L'Exploration de la Magn tosph re Terrestrelle ." ... Les aurores polaires, les ceintures de radiation, le vent solaire, les orages magn tiques, la "m t o de l' espace",les radiations cosmiques vous sont expliqu s dans ce site. them. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Fmap.htm -- 17.6 Кб -- 22.12.2007
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2059. Les premiers observateurs du Ciel et du Soleil
... Tr s t t, les observateurs des toiles - particuli rement les pr tres de l'Egypte et de Babylone, pays semi d sertiques o les cieux sont rarement assombris - ont t fascin s par la vo te clout e d' toiles qui semblait s'arquer au-dessus d'eux, et par le cycle quotidien du soleil, qui semblait au del de toute compr hension, d ordre surnaturel. ... Entre les deux, le soleil parcourt un arc Иtendu , et mi-chemin entre son lever et son coucher, il est au plus haut dans une direction que vous appelez Sud ....
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Fsky.htm -- 13.8 Кб -- 22.12.2007
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2060. From Stargazers to Starships
... Spanish translation of "Stargazers" by J. M. Mendez and Horacio Chavez . ... Astronomy of the Earth's motion in space: . ... The Path of the Sun, the Ecliptic . ... 4b. Optional: Libration of the Moon . ... Kepler's 3 Laws of Planetary Motion ," a one-hour overview lecture to teachers presented 23 March 2005. Guide to the sections on Kepler's Laws which follow below. ... 11a. Ellipses and Kepler's First Law . ... Kepler's Second Law . 12a. More on Kepler's Second Law . ... Kepler's Third Law . ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Smap.htm -- 15.5 Кб -- 22.12.2007
[ Сохраненная копия ] Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Smap.html -- 15.5 Кб -- 22.12.2007
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[ Сохраненная копия ] Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Smap.html -- 15.5 Кб -- 22.12.2007
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