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1441. Seasons of the Year --lesson plan #5
The link between the tilt of the Earth's axis to the ecliptic and seasons of the year--length of day, effectiveness of sunlight, polar day and night, and seasons south and north of the equator, as well as near it. ... This lesson plan supplements: "Seasons of the Year," section #3: on disk Sseason.htm , on the web . ... Actually, Earth is most distant from the Sun in summer! ... Because of the inclination angle i, sometimes the North Pole of the Earth leans towards the Sun, sometimes it leans away. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/ILseason.htm -- 12.6 Кб -- 22.12.2007
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1442. Newton and his Laws--Lesson Plan #25
Lesson Plan #25 http://www.phy6.org/stargaze/Lnewton.htm . A short lesson, introducing Newton's laws--what they state, and what the intuitive meaning is of the first and third laws . ... This lesson plan supplements: "Newton and his Laws," section #10 . ... The traditional wording of Newton's 3 laws of motion, . ... A qualitative definition of two concepts due to Newton: Force and Inertia . ... the laws of motion . ... By Newton's first law, does mere motion require a force? ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/ILnewton.htm -- 13.0 Кб -- 22.12.2007
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1443. Lesson #28b Momentum
... One useful consequence of Newton's 3rd law is the conservation of momentum, as is shown by analyzing the recoil of a cannon. The example shows that while the gun and shell get equal amounts of momentum, by far most of the energy is given to the shell. Here mechanical energy is not conserved--some ends up as heat. ... We have discussed so far mass, velocity, acceleration, force and energy, and the way Newton's laws tie them together. ... momentum P = mass times velocity . ... Total mass . ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/ILmoment.htm -- 16.7 Кб -- 22.12.2007
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1444. The Round Earth and Christopher Columbus
... After going through several logical arguments for the Earth's sphericity (which have not held up over time), Aristotle wrote: . ... Again, our observations of the stars make it evident, not only that the earth is circular, but that it is a circle of no great size. ... There is much change, I mean, in the stars which are overhead, and the stars seen are different, as one moves northward or southward. ... Back to the main file (8) The Round Earth and Christopher Columbus . ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Iaristot.htm -- 4.5 Кб -- 22.12.2007
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1445. Lesson 22b--Airplane Flight
... In aviation it is usually more convenient to consider the motion of air over a wing or over a propeller blade in their own frames of reference. This lesson examines swept-back airliner wings (also at swept-forward and swiveled wings), and at the loss of propeller efficiency when the airplane gains forward speed. ... 22c " Airplane Flight, " Sflight.htm , . ... In addition, L depends on the "angle of attack" between the wing and the air flow, and of course on the size and design of the wing. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/ILflight.htm -- 14.5 Кб -- 22.12.2007
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1446. Energy--Lesson Plan #24
... This topic stresses mechanical energy, potential and kinetic, and also describes conversion between types of energy (while conserving the total amount), units, and the special position of heat. ... This lesson plan supplements: "Energy," section #15 http://www.phy6.org/stargaze/Senergy.htm . ... 18d: Work Against an Electric Force: The Van De Graaff generator . ... The conservation of energy in its conversion from one form to another. Units of energy--Joule, calorie, also watt and kilowatt-hour. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/ILenergy.htm -- 19.9 Кб -- 22.12.2007
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1447. The Round Earth and Christopher Columbus--lesson plan #12
A historical review, starting with the existence of the horizon at sea, proceeding to various studies of the Earth's size and shape, and leading to the attempt by Columbus to reach India by sailing westward. A related unit, also included in this lesson plan . ... This lesson plan supplements: "The Round Earth and Christopher Columbus" section #8, on disk Scolumb.htm , on the web . ... Understand why the Earth is round (see optional discussion at the end of this lesson plan).] ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/ILcolumb.htm -- 15.2 Кб -- 22.12.2007
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1448. Motion in a Circle--Lesson Plan #29
Lesson Plan #29 http://www.phy6.org/stargaze/Lcircul.htm . A short but important section, deriving centripetal acceleration for motion at constant speed around a circle. ... That the "centripetal acceleration" of an object going around a circle of radius R with constant speed v equals v 2 /r and is directed towards the center of the motion. ... Terms: uniform circular motion, frequency, peripheral velocity, centripetal acceleration and force. ... A newer one An older one Timeline Glossary . ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/ILcircul.htm -- 11.6 Кб -- 22.12.2007
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1449. The Celestial Sphere--lesson plan #1a
An introduction to the celestial sphere, describing its . apparent rotation and the special role of the pole star. ... This lesson plan supplements the web page listed below. Originally named "The sky above us" , it was split into two parts, each of which now has a lesson plan. ... Celestial sphere, constellation, zodiac, celestial pole, the Pole Star ("Polaris"), celestial equator, rotation of the Earth, planets [theodolite, equatorial axis]. ... What makes the Pole Star special? ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/ILcelsph.htm -- 11.0 Кб -- 22.12.2007
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1450. The Calendar--lesson plan #10
An overview of solar and lunar calendars, their history and lore. Also, of the day and the month, and their relations to the rotation period of the Earth and the orbital period of the Moon. ... This lesson plan supplements: "The Calendar," section #6: on disk Scalend.htm , on the web . ... Terms: solar day, star day (sidereal day), solar year, Julian calendar, leap year, Gregorian calendar, true (sidereal) and apparent (synodic) period of the Moon, Metonic calendar, Moslem calendar. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/ILcalend.htm -- 15.5 Кб -- 22.12.2007
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1451. http://www.cosmos.ru/mirrors/stern/earthmag/Dmaglist.htm
In Erinnerung an das 400j hrige Jubil um von "De Magnete" von William Gilbert of Colchester . Deutsche Bearbeitung von Sven Friedel . Der grosse Magnet, die Erde" - Einf hrungseite . ... von Stuart Malin und David Barraclough aus Eos vom 23. ... Magnetismus von Gilbert bis 1820 . Oersted and Ampere verbinden Elektrizit t und Magnetismus . ... Gau und das Erdmagnetfeld . ... Der Dynamoproze . Ein selbsterhaltender Dynamo im Erdkern . ... Der Dynamo zwischen Jupiter und seinem Mond Io . ...
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Ссылки http://www.cosmos.ru/mirrors/stern/earthmag/Dmaglist.htm -- 5.7 Кб -- 22.12.2007
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1452. The Round Earth and Christopher Columbus
... After going through several logical arguments for the Earth's sphericity (which have not held up over time), Aristotle wrote: . ... Again, our observations of the stars make it evident, not only that the earth is circular, but that it is a circle of no great size. ... There is much change, I mean, in the stars which are overhead, and the stars seen are different, as one moves northward or southward. ... Back to the main file (8) The Round Earth and Christopher Columbus . ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Saristot.htm -- 4.5 Кб -- 22.12.2007
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1453. Discovery of the Sunspot Cycle
... The weather throughout this year was so extremely favorable that I have been able to observe the Sun clearly on 312 days; however, I counted only 34 groups of sunspots.. From my earlier observations, which I have reported every year in this journal, it appears that there is a certain periodicity in the appearance of sunspots and this theory seems more and more probable from the results of this year.. ... Year . ... Days when no . ... Observation Days . ... 273 . ... 282 . ... 244 . ... 149 . ...
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Ссылки http://www.cosmos.ru/mirrors/stern/earthmag/whschwab.htm -- 5.0 Кб -- 22.12.2007
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1454. FAQ-3: "The Great Magnet, the Earth"
... Listed below are questions submitted by e-mail to the author of "The Great Magnet, the Earth." ... Only some of the questions that arrive are listed, either because they keep coming up again and again--on the reversal of the Earth's magnetic field, for instance-- or because the answers add extra details, which might interest other users. ... Measuring Earth's magnetic field . ... Could generated electricity affect Earth's magnetic field? ... Earth magnetism from rotating electric charges? ...
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Ссылки http://www.cosmos.ru/mirrors/stern/earthmag/magnQ&A3.htm -- 67.5 Кб -- 22.12.2007
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1455. FAQ-2: "The Great Magnet, the Earth"
... Listed below are questions submitted by e-mail to the author of "The Great Magnet, the Earth." ... Only some of the questions that arrive are listed, either because they keep coming up again and again--on the reversal of the Earth's magnetic field, for instance-- or because the answers add extra details, which might interest other users. ... Measuring Earth's magnetic field . ... Magnetic Shielding . ... Is Earth held in its orbit by magnetic forces? ... Earth magnetism from rotating electric...
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Ссылки http://www.cosmos.ru/mirrors/stern/earthmag/magnQ&A2.htm -- 37.4 Кб -- 22.12.2007
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1456. Der magnetische Sonnenzyklus
Zu der Zeit, als Gau das erdmagnetische Feld studierte, suchte anderswo in Deutschland ein gewissenhafter Amateurastronom namens Heinrich Schwabe , von Beruf Apotheker, nach einem neuen unbekannten Planeten. ... Sonnenflecken" . ... Offensichtlich bremste das magnetische Feld den W rmeflu aus dem Sonneninneren und dunkelte damit die Sonnenflecken gegen ber der ungest rten restlichen Sonnenoberfl che ab. Der Beweis f r den Magnetismus der Sonnenflecken war das von ihnen abgestrahlte Licht . ...
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Ссылки http://www.cosmos.ru/mirrors/stern/earthmag/Dsunspot.htm -- 8.0 Кб -- 22.12.2007
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1457. Magnetische Polumkehr und Kontinente in Bewegung
Tr gt man die H he ber dem Meeresspiegel f r alle Teile der Erde auf - einschlie lich der Gebiete unter dem Meeresspiegel - bemerkt man eine interessante Tatsache: Die H hen gruppieren sich mehrheitlich in zwei Clustern, d.h. sie k nnen je einer von zwei Gruppen zugeordnet werden. ... Die Ozeane sind ungef hr gleich tief, und die Kontinente sind ebenfalls einheitliche Gebilde, m chtig genug, sich aus dem Wasser zu erheben. ... Sind solche Ereignisse gef hrlich, bedrohen sie das Leben auf der Erde? ...
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Ссылки http://www.cosmos.ru/mirrors/stern/earthmag/Dreversl.htm -- 14.8 Кб -- 22.12.2007
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1458. Magnetismus der Planeten
... Doch dann begann man, andere Planeten unseres Sonnensystems n her zu untersuchen und heute wissen wir, da nur die Venus berhaupt keinen Magnetismus besitzt. ... Wenn die Felder der Erde und des Jupiter beide in erster N herung Dipolfelder waren (also den Feldern von Stabmagneten im Zentrum der Planeten glichen), dann m te Jupiters Magnetfeld etwa 20,000 mal st rker sein als das der Erde. ... Neben den Strahlungsg rteln gibt es auf dem Jupiter auch Polarlicht, wie Bilder des Hubble-Teleskops beweisen...
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Ссылки http://www.cosmos.ru/mirrors/stern/earthmag/Dplnetmg.htm -- 12.4 Кб -- 22.12.2007
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1459. Personenregister
Verweise zu Kurzbiographien f r einige der in dieser Webausstellung . genannten Wissenschaftler auf der Webseite der TU Braunschweig zur . Geschichte der Geophysik . von Walter Kertz, Hrsg. Ruth Kertz und Karl-Heinz Gla meier) . ... Humboldt, Alexander von . ... Kurator: Dr. David P. Stern . E-mail an Dr.Stern: earthmag ("at" symbol) phy6.org . Kurator: David P. Stern earthmag ("at" symbol) phy6.org . ...
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Ссылки http://www.cosmos.ru/mirrors/stern/earthmag/Dpersreg.htm -- 4.7 Кб -- 22.12.2007
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1460. Oertsted und Ampere verbinden Elektrizit t und Magnetismus
Vor 1820 war die einzig bekannte Form von Magnetismus die von Eisenmagneten und nat rlichem Magneteisenstein. ... Leiterschleifen ziehen sich an. ... Maxwell Jetzt gab es also zwei Arten von Kraftwirkung, die mit der Elektrizit t in Verbindung standen -- die elektrische und die magnetische. ... Aus dieser Verbindung entsprang die Idee, da Licht ein elektrisches Ph nomen sein mu te, die Entdeckung von Radiowellen, die Relativit tstheorie und eine ganze Menge mehr Konzepte der heutigen Physik. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/earthmag/Doersted.htm -- 8.3 Кб -- 22.12.2007
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