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1421. The Truth About Pyecraft
... Since you will be abject, since you will behave as though I was not a man of honour, here, right under your embedded eyes, I write the thing down -- the plain truth about Pyecraft. ... Mr Pyecraft?' said I, at the front door. ... Then I could hear a curious pattering upon the door, almost like some one feeling for the handle in the dark, and Pyecraft's familiar grunts. ... There he was right up close to the cornice in the corner by the door, as though some one had glued him to the ceiling. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Spyecraft.htm -- 22.1 Кб -- 22.12.2007
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1422. Global Climate, Global Wind Flow
... Sunlight Earth . ... S-1B. Global Climate . ... The distribution of the Sun's heat over surface of Earth Sun's heat is quite uneven. ... As heat diffuses through the layers of the atmosphere, it is also spread by atmospheric flows, by winds. ... All air flows are powered by the heat energy . ... The overall effect is an eastward flow of air (winds blowing from the west or " westerlies ") at middle latitudes, and a westward flow of air (" easterlies " blowing from the east ) in the equatorial region ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Sweather2.htm -- 17.7 Кб -- 22.12.2007
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1423. http://www.cosmos.ru/mirrors/stern/stargaze/Sweather1.htm
... A more detailed (but qualitative) discussion of heat flow in the atmosphere and related weather processes, including the roles of buoyancy, convection and humidity. ... Heat makes it expand, it becomes less dense than the surrounding air and buoyant, and it rises like a hot-air balloon (or like a drop of oil in a bottle of water). ... The important thing to remember when dealing with convective flows, is that the higher one is in the atmosphere, the lower are the pressure and density of the air. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Sweather1.htm -- 17.5 Кб -- 22.12.2007
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1424. "Get a Straight Answer"
... What if the Earth's axis were tilted 90? to the ecliptic? ... I am no good judge of that, but also note that the abstract seems to refer to the solar wind above the Sun's poles, where field lines stick straight out and solar wind velocity is about double what it is near the ecliptic. ... If you launch parallel to the Earth's orbit you get the advantage of the Earth's orbital velocity of 30 km/s, but the distance is greater, so you need a greater average velocity to cover it in two weeks. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/StarFAQ10.htm -- 65.8 Кб -- 22.12.2007
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1425. Stargazers and Skywatchers--lesson plan #1
... This lesson plan supplements the material on the web page . Stargazers and Skywatchers," on disk Ssky.htm , on the web . ... Recognize the daily motion of the Sun across the sky, defining the main directions of east, west, south and north . ... Terms learned: East, west, south, north, horizon, equinox, winter solstice, summer solstice, elevation of the Sun )above the horizon). ... You watch the shadow of a flagpole on a sunny day. ... The noon sun is in the south, so the shadow points north. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Lskywatch.htm -- 14.3 Кб -- 22.12.2007
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1426. "Get a Straight Answer"
... The ones included below are either of the sort that keeps coming up again and again, or else the answers make a special point, often going into details which might interest many users. ... About asteroids hitting Earth. ... Asymmetry of the Moon's orbit. Measuring distance from the Sun. ... Where do gravity of Earth and Sun balance? ... The situation is similar with gravitational energy--say, planets around the Sun, or satellites around Earth: all bound orbits have negative energy. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/StarFAQ15.htm -- 78.5 Кб -- 22.12.2007
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1427. The Rotating Earth
... 23a. The Centrifugal Force . ... 24a.The Rotating Earth . ... Sunlight Earth . ... One important rotating frame is the surface of the Earth, rotating with a period of about 24 hours--more accurately, 23 hrs 56.07 min or 86164 seconds. ... To derive the centrifugal acceleration on the equator (i.e. the force in Newtons on one gram mass, rotating with the Earth), we calculate in meters and seconds . ... Effective gravity on the equator is reduced by the rotation, but only by about 1/3 of a percent . ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Srotfram1.htm -- 16.2 Кб -- 22.12.2007
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1428. The Answer Man--arranged by subject
... 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. ... Sun and Solar System . ... 5b Gravity . ... 29) Gravity at the Earth's Center . ... 219) Gravity at the Earth's center (see #29 above, also #180 in (7e)) . ... 180) Gravity at the Earth's center . ... 225) "Drag" by the Sun on the Earth's motion? ... 188) No "Man in the Moon" from Australia? ... 84) How far does Earth's Gravity Extend? ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/StarFSubj.htm -- 38.0 Кб -- 22.12.2007
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1429. http://www.cosmos.ru/mirrors/stern/stargaze/Spaceflt1.htm
... Astronomy index . ... This is the final part of "From Stargazers to Starships," a historical overview of spaceflight, stressing the technology of rockets, satellites and orbits, and its use in unmanned missions. ... The principles of rocketry and its evolution, from early Chinese rockets to Robert Goddard's work (especially the adaptation of the DeLaval nozzle), to rocket development in WW II and to the " space race " after the launch of Sputnik 1. ... Far-out Pathways to Space: Great Guns? . ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Spaceflt1.htm -- 6.7 Кб -- 22.12.2007
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1430. http://www.cosmos.ru/mirrors/stern/stargaze/Smechopen.htm
... Astronomy index . ... Space index . ... It thus omits rigid body mechanics--no torque or moment of inertia--but includes mass measurements in the weightless environment of a space station (with a simple related experiment), synchronous orbits and space trajectories from Earth to Mars. The stress is on concepts , such as vectors and their applications, mass and inertia, and uses of frames of references, including the thorny question of centripetal vs. centrifugal. ... Newton's Second Law . ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Smechopen.htm -- 8.2 Кб -- 22.12.2007
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1431. The Man who Could Work Miracles
... Why not?" said Mr. Maydig. Of course it doesn't stop. You stop the rotation of the earth, you know. Time stops. ... H'm!" said Mr. Fotheringay. ... He willed it only just in time, for his clothes, heated by his rapid flight through the air, were already beginning to singe. ... A vast wind roared throughout earth and heaven' so that he could scarcely lift his head to look. ... But he perceived that his miracle had miscarried, and with that a great disgust of miracles came upon him. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Smiracle.htm -- 9.3 Кб -- 22.12.2007
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1432. (S-8) Energ?a Nuclear
... Nota: este es un peque?o paseo relativo a lo b?sico de la energ?a nuclear , m?s all? del objetivo principal de "De Astr?nomos a naves espaciales". ... La forma en que el sol genera su energ?a ayuda a entender la manera en que una estaci?n de energ?a nuclear lo hace. ... Ellos pueden atraer otros nucleones y combinarse con ellos para formar nucleos m?s pesados, un proceso que libera energ?a. Por ejemplo, en el Sol, pares de protones se combinan con pares de neutrones para formar n?cleos de helio . ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Mnuclear.htm -- 33.1 Кб -- 22.12.2007
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1433. Maintaining my Educational Web Sites
... These educational web sites were started in 1994, intending to open up to the general public (as well as students and teachers) areas of physics, astronomy and space, as well as the study of magnetism of Earth and of its space environment. ... The question-and-answer sections of the three sites are constantly expanded, as new material comes in; as of May 2004, in the three above web sites, they contain (135, 48, 75) items. ... The layout of the web pages is similar to the one used here. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/WhatIdo1.htm -- 26.8 Кб -- 22.12.2007
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1434. La Stella
... Fu per Capodanno che venne dato quasi simultaneamente da tre osservatori l'annuncio che il moto del pianeta Nettuno, il pi esterno dei pianeti che ruotano intorno al Sole, era divenuto assai irregolare. ... Era una vasta massa di materia, pesante e voluminosa, che dall'oscurit misteriosa degli spazi irrompeva senza preavviso nell'area di irraggiamento del Sole. ... La stella non era una stella, ma solo del gas, una cometa; e se pure era una stella non avrebbe potuto probabilmente colpire la Terra. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Ithestar.htm -- 32.6 Кб -- 22.12.2007
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1435. Les points L4 et L5 de Lagrange -- Un autre calcul
... Ce calcul sur les points L4 et L5 est inspir? de "When Trojans and Greeks Collide" de I. Vorobyov, "Quantum," p. 16-19, Sept-Oct. ... Nous supposerons que le mouvement s' effectue dans le plan de ce triangle, qui restera plan lui m?me, puisque seules ces forces y sont pr?sentes. ... Ce triangle doit pouvoir tourner autour d'un certain point O, avec une p?riode constante T. Voyons si avec ce type de mouvement, toutes les forces peuvent rester en ?quilibre, ce qui impliquerait que c'est possible. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Flagrng3.htm -- 16.4 Кб -- 22.12.2007
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1436. The Star
... A Planetary Collision," one London paper headed the news, and proclaimed Duchaine's opinion that this strange new planet would probably collide with Neptune. The leader writers enlarged upon the topic; so that in most of the capitals of the world, on January 3rd, there was an expectation, however vague of some imminent phenomenon in the sky; and as the night followed the sunset round the globe, thousands of men turned their eyes skyward to see--the old familiar stars just as they had always been. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Sthestar.htm -- 27.9 Кб -- 22.12.2007
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1437. "Stargazers" in the Classroom--additions
A set of 42 lesson plans , covering sections #1 to #24 (but not #12a), linked to a home page and meant to help teachers prepare this material for classroom use. ... New terms used . ... If you may use this material in your classroom, or have done so, the author, Dr. David P. Stern, would appreciate receiving from you (1) Your name (2) Address (3) E-mail (4) School (5) Grade-s in which this material is used (6) The sections of "Stargazers" used (or "all") (7) Any special interests or comments. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Steachr2.htm -- 5.0 Кб -- 22.12.2007
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1438. Submission of questions
Questions relevant to "From Stargazers to Starships" will be answered, to the extent time allows. If a question seems to be worthy of broader interest, it and its answer (suitably edited) may be added to the list appearing in "Stargazers." ... Please do observe the following: . ... Asking about matters which are far beyond the scope of "Stargazers." ... Posing a question without first checking if it was answered in the main files of "Stargazers" or in the question-and-answer list. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/SFAQinst.htm -- 2.9 Кб -- 22.12.2007
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1439. One of Gilbert's Experiments
... This is an attempt to recreate Glbert's experiment on induced magnetism. ... A fairly strong bar magnet. ... Prop the bar magnet in the box (or whatever you use), so that it stands vertically, one pole up. (a) Cut and straighten the pieces of soft iron wire. (b) Cut two short lengths of string (5 cm or 2") . ... First stick one end of the string near the end of the tape (drawing A), stick that end to the wire, roll it around the wire and insert the other end on the opposite side of the wire (B). ...
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Ссылки http://www.cosmos.ru/mirrors/stern/earthmag/gilbexpt.htm -- 6.8 Кб -- 22.12.2007
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1440. The Discovery of the Solar System--lesson plan #17
... A discussion of retrograde motion of planets helps the students understand the logic underlying the ideas of both Ptolemy and Copernicus. ... This lesson plan supplements: "The Discovery of the Solar System," section #9c: on disk Ssolsys.htm , on the web . ... Learn about the system proposed by Copernicus, and the way it explained retrograde motion: all planets moved in circles around the Sun, but the ones closer to the Sun always moved faster. ... Did this predict correct planetary motions? ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/ILsolsys.htm -- 14.7 Кб -- 22.12.2007
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