Groupe Samajam - Team Builing, École et Spectacle. Les principes de la thermodynamique. Depuis le XVIeme siècle physiciens et mathématiciens ont étudié le mouvement des corps, posant les principes de la mécanique. Cette discipline se subdivise en trois sciences : la statique qui étudie l'état d'équilibre des corps soumis à l'action des forces, la cinématique qui étudie la position des objets dans le temps et la dynamique qui étudie les mouvements des corps. Se greffe sur ces lois l'action de la température. Température, chaleur, énergie, désordre, entropie, tous ces mots nous semblent familiers pourtant ces concepts n’a pas facilement supplanter les idées d’antan. Faisant partie de l'Histoire de la thermodynamique, remémorons-nous brièvement ses principales découvertes.
Grâce à la loi de Boyle-Mariotte, plongeurs et physiciens savaient depuis le XVIIeme siècle que le volume d'un gaz (V) était lié à une relation entre sa température à sa pression (P) : à température constante, le produit PV est constant. L'équilibre thermodynamique Définition de l'entropie Emoy = 3/2 kB T. Kirshner, R.P.: The Extravagant Universe: Exploding Stars, Dark Energy, and the Accelerating Cosmos. One of the world's leading astronomers, Robert Kirshner, takes readers inside a lively research team on the quest that led them to an extraordinary cosmological discovery: the expansion of the universe is accelerating under the influence of a dark energy that makes space itself expand. In addition to sharing the story of this exciting discovery, Kirshner also brings the science up-to-date in a new epilogue.
He explains how the idea of an accelerating universe--once a daring interpretation of sketchy data--is now the standard assumption in cosmology today. This measurement of dark energy--a quality of space itself that causes cosmic acceleration--points to a gaping hole in our understanding of fundamental physics. In 1917, Einstein proposed the "cosmological constant" to explain a static universe.
When observations proved that the universe was expanding, he cast this early form of dark energy aside. Review: "An extravagant and thoroughly enjoyable account of our amazing universe. " Series: Boellstorff, T.: Coming of Age in Second Life: An Anthropologist Explores the Virtually Human. Millions of people around the world today spend portions of their lives in online virtual worlds. Second Life is one of the largest of these virtual worlds. The residents of Second Life create communities, buy property and build homes, go to concerts, meet in bars, attend weddings and religious services, buy and sell virtual goods and services, find friendship, fall in love--the possibilities are endless, and all encountered through a computer screen.
Coming of Age in Second Life is the first book of anthropology to examine this thriving alternate universe. Tom Boellstorff conducted more than two years of fieldwork in Second Life, living among and observing its residents in exactly the same way anthropologists traditionally have done to learn about cultures and social groups in the so-called real world. Coming of Age in Second Life shows how virtual worlds can change ideas about identity and society. Review: More reviews Table of Contents This book has been translated into: Polish. Homework and Study Help - Free help with your algebra, biology, environmental science, American government, US history, physics and religion homework. Can I take a course at HippoCampus for credit? How do I enroll in a course at HippoCampus? Are there any fees to take your courses? How do I make a comment or ask a question? How do I get individual help with my homework assignment? What are the preferred texts?
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