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1341. The Answer Man--arranged by subject
... Listed below are questions submitted by users of "From Stargazers to Starships" and the answers given to them. ... In "The Great Magnet, the Earth" on magnetism of the Earth. In "The Exploration of the Earth's Magnetosphere" on the magnetic environment of Earth in space. ... 11) Why don't we feel the Sun's gravity pull? ... 148) View of Earth and Moon from Mars . ... 29) Gravity at the Earth's Center . ... 84) How far does Earth's Gravity Extend? 96) Where do gravity of Earth and Sun balance? ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/IstarFSubj.htm -- 22.9 Кб -- 22.12.2007
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1342. Voli spaziali e astronavi
Mappa del sito . Questa la parte finale del sito "Dagli astronomi alle astronavi", un panorama storico dei voli spaziali, con particolare enfasi sulla tecnologia dei razzi, satelliti e orbite, e sull'uso nelle missioni senza equipaggio umano. ... Metodi inusuali per il volo spaziale -- energia nucleare, cannoni a gas leggero, vele solari e motori a ioni. ... I voli spaziali . ... 29c. Satelliti per osservare lo spazio vicino . ... 29e. Le missioni verso i pianeti e verso lo spazio esterno . ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Ispaceflt1.htm -- 5.6 Кб -- 22.12.2007
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1343. (S-1B) Climats et vents envisag?s globalement
... La distribution des surfaces terrestres chauff?es par le soleil n'est pas du tout uniforme. ... Si l'air en provenance de la zone ?quatoriale garde sa vitesse initiale ouest en est, il d?passe la r?gion envisag?e, et on dira que les vents sont des vents " d'ouest ", qu'ils pr?dominent de l'ouest ? l'est . ... Bien connu des m?t?orologues, il est fournisseur du vent arri?re souhait? par les avions de ligne en direction de l'est, et ?vit? (si possible) pour les vols vers l'ouest. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Fsweather2.htm -- 16.2 Кб -- 22.12.2007
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1344. (S-1A) Rapports entre temps et atmosph?re
... Voici une Extension facultative de la section (S-1) "les rayons du soleil et la terre" La r?partition de la chaleur par l'atmosph?re et le temps qui en d?coule, dont les r?les de la "flottabilit?", de la convection et de l'humidit?. "les ?coulements et les climat en g?n?ral est pr?sent?e plus en d?tails (mais qualitativement) dans la section S1-B. Le vent vient de n'importe o? et d'ailleurs, . ... C'est pourquoi les sommets des montagnes sont froids et que les plus hautes sont couvertes de neige. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Fsweather1.htm -- 15.5 Кб -- 22.12.2007
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1345. Vaisseaux spatiaux
... Depuis l'?poque de Spoutnik et d'Explorer 1, il y a eu des milliers de vaisseaux spatiaux avec, pour certains, des passagers humains. ... 77 ans, Glenn est retourn? dans l'espace ? ... Il a ?t? suivi (aux USA) par "G?mini" dont la capsule pour deux hommes fut satellis?e par la fus?e Titan ,plus puissante. ... Le vol spatial humain' est aujourd'hui bas? sur la navette spatiale , un v?hicule- fus?e r?utilisable, avec des ailes courtes , qui lui permettent d'atterrir sur une piste comme les avions. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Fspacecrft.htm -- 12.3 Кб -- 22.12.2007
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1346. Gauss et le champ magn tique global
... A la fin de sa vie, il publia ses recherches dans une monumentale oeuvre intitul e . ... Gauss et son associ , Weber, firent construire un laboratoire pour tudier le magn tisme, c'est dans ce m me laboratoire qu'ils con?urent le premier t l graphe magn tique. ... Il connaissait galement une m thode utilis e en m canique c leste pour l'analyse de la gravitation et l'appliqua pour d crire les forces magn tiques dans la r gion de la Terre ; appel es"le champ magn tique." ...
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Ссылки http://www.cosmos.ru/mirrors/stern/earthmag/gauss_fr.html -- 7.6 Кб -- 22.12.2007
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1347. Angle of the Sun's Rays --lesson plan #6
... This lesson plan supplements: . 4 "Angle of the Sun's Rays" at Sunangle.htm , . ... At that time, in the middle, northern latitudes (e.g. in the continental US or Europe) the Sun is exactly south of the observer. ... At any given place, at what time of the day do the Sun's rays fall most steeply (towards the perpendicular) onto the ground? ... The rays fall steepest at noon, when the Sun is highest above the horizon; The angle is least steep at sunrise and sunset. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/ILsunangl.htm -- 6.4 Кб -- 22.12.2007
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1348. Our View of the Sun--Lesson Plan #37
Lesson Plan #37 http://www.phy6.org/stargaze/Lsun2vue.htm . An introduction to solar observations--by eye or telescope (with cautions) and during eclipse. Also, the distance of the Sun, its layers, the corona and the solar wind. ... This lesson plan supplements: (S-2) Our View of the Sun: on disk Sun2view.htm , on the web http://www.phy6.org/stargaze/Sun2view.htm . ... About the solar wind and its connection to the Sun's corona. ... How does one observe an eclipse? ... What is the solar wind? ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/ILsun2vue.htm -- 18.7 Кб -- 22.12.2007
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1349. Sunlight and the Earth--Lesson Plan #36
... A discussion of the solar heating of the Earth and atmosphere, its heat loss processes, and the way these relate to weather and climate. ... This lesson plan supplements: (S-1) Sunlight and the Earth: on disk Sun1lite.htm , on the web http://www.phy6.org/stargaze/Sun1lite.htm . ... Originally " Sunlight and the Earth " also covered weather and climate, but these subjects now have separate web pages Weather and the Atmosphere and Global Climate, Global Wind Flow , with separate lesson plans. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/ILsun1lit.htm -- 22.0 Кб -- 22.12.2007
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1350. La Esfera Celestial--Plan de lecciones #1a
Una introducci?n a la esfera celestial, describiendo su . rotaci?n aparente y el papel especial de la estrella polar. ... La Esfera Celestial," secci?n #1a: . ... El estudiante tambi?n se dar? cuenta que otros objetos celestiales--el Sol, la Luna y los planetas-- comparten la rotaci?n (y por lo tanto la salida y puesta), a?n y cuando sus posiciones junto con las estrellas cambien lentamente. ... Son fijas las posiciones de las estrellas en la esfera celestial, unas con respecto a las otras? ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/LMXcelsph.htm -- 13.2 Кб -- 22.12.2007
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1351. The Sundial --lesson plan #4
... This lesson plan supplements: "The Sundial," section #2a: on disk Sundial.htm , on the web . ... Know the design, principle and orientation of a sundial, the type with a gnomon pointing towards the pole of the heavens. ... The "Sundial Bridge" across the Sacramento River in Redding, California. Start asking the class--does anyone have a sundial in the garden, or seen one in a public place? ... At a suitable time (as part of the lesson, or afterwards) have the students construct paper sundials. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/ILsundial.htm -- 9.3 Кб -- 22.12.2007
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1352. The Magnetic Sun --lesson plan #38
An overview of phenomena related to the magnetism of the Sun, in particular to sunspots and their 11-year cycle, solar flares and magnetic disturbances at Earth caused by "solar activity." ... This lesson plan supplements: "The Magnetic Sun," section #S-3: on disk Sun3mag.htm , on the web . ... About the 11-year sunspot cycle and its discovery. ... Terms: Sunspot, magnetic field lines, magnetic fields, sunspot cycle, solar activity, solar flare, magnetic storm, magnetic energy . ... from Earth . ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/ILsun3mag.htm -- 21.2 Кб -- 22.12.2007
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1353. Lesson 35--Rotating Frames of Reference in Space and on Earth
... This lesson continues to explore rotating frames of reference, focusing on the weightless environment in space and on a qualitative discussion of the Coriolis force. ... Rotating Frames of Reference in Space and on Earth," section #24 http://www.phy6.org/stargaze/Srotfram.htm . ... Terms: weightlessness (or zero-g), artificial gravity, Coriolis force. ... This lesson continues the exploration of rotating frames of reference, in particular two of their features: weightlessness and the Coriolis force....
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/ILrotfram.htm -- 15.3 Кб -- 22.12.2007
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1354. Precession--lesson plan #11
A brief study of the precession of the equinoxes and of its possible link to the occurrence of ice ages. ... This lesson plan supplements: "Precession," section #7: on disk Sprecess.htm , on the web . ... Understand the reason for that shift--the Earth's axis moving around a cone with a half-angle of about 23.5?, making one full circuit of the cone every 26,000 years. ... Since the Earth's axis moves around a cone every 26000 years, the position of the pole in the sky during that time traces a circle. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/ILprecess.htm -- 14.9 Кб -- 22.12.2007
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1355. Finding the Pole Star --lesson plan #2
A closer look at the pole star and the neighboring . constellations, especially the Big Dipper and Cassiopeia . ... This lesson plan supplements: "Finding the Pole Star," section #1a: on disk Spolaris.htm , on the web . ... Know the constellations of the Big Dipper and Cassiopeia, and their use in finding the Pole Star. ... Why do you think Alaska chose the pole star and the Big Dipper to be on its flag? ... You will probably never see there the pole star and rarely see the Big Dipper.) ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/ILpolaris.htm -- 10.1 Кб -- 22.12.2007
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1356. Parallax--Lesson Plan #14
An introduction to "pre-trigonometry," the estimate of the distance to a far-away point C to which the lines of sight from the two ends (A,B) of a "baseline" AB make a small angle ?. ... This lesson plan supplements: "Parallax," section #8b: on disk Sparalax.htm , on the web . ... Start of the lesson: When you observe a distant object from two separate locations, you get slightly different views, because you view it from two different angles. ... What is the " baseline " in a parallax measurement? ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/ILparalax.htm -- 13.9 Кб -- 22.12.2007
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1357. Lesson #28a Newton's 3rd Law
... This lesson presents and explains Newton's 3rd law ("To every action, an equal and opposite reaction"), gives some examples as well as an (optional) formulation of Newton's laws that avoid explicitly mentioning forces. ... The formal definition of Newton's 3rd law: " forces always originate in pairs, equal in magnitude and opposite in direction. ... Starting the lesson . ... Newton's 3rd law discusses the origin of forces: they are always created in pairs, equal in magnitude and opposite in...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/ILnewton3.htm -- 16.9 Кб -- 22.12.2007
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1358. Newton's Second Law--Lesson Plan #27
Lesson Plan #27 http://www.phy6.org/stargaze/Lnewt2nd.htm . A short section, recapitulating earlier ideas of force and inertia (also known as mass). It summarizes Newton's laws, defines the unit of force known as "Newton," and gives as a practical application of the second law the acceleration of the German V-2 rocket, used in World War II. ... This lesson plan supplements: "Newon's Second Law," section #18 . ... Mass . ... An unthinking application of Newton's second law would give . ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/ILnewt2nd.htm -- 11.6 Кб -- 22.12.2007
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1359. Navigation--lesson plan #8
... Latitude can be deduced from the height above the horizon of the pole star or of the noontime Sun, while longitude requires an accurate clock giving universal time. ... This lesson plan supplements: "Navigation," section #5a: on disk Snavigat.htm , on the web . ... Understand how finding one's local longitude requires comparing local time (e.g. local noon, when the Sun is at its highest above the horizon), with universal time, (UT). ... How can the noontime Sun give you your latitude ?? ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/ILnavigat.htm -- 14.2 Кб -- 22.12.2007
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1360. Latitude and Longitude --lesson plan #7
... Also introduces systems of time-keeping, e.g. local solar time, time zones, universal time and the international date line. ... This lesson plan supplements: "Latitude and Longitude," section #5: on disk Slatlong.htm , on the web . ... Declination is measured from the north pole, not from the equator (the way co-latitude is defined) . ... In this case, it is the line of latitude 49 degrees. ... How long is one minute of arc along a line from the pole to the equator (line of longitude)? . ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/ILlatlong.htm -- 17.1 Кб -- 22.12.2007
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