Black hole

Black hole

Existenta black holes-urilor a fost intuita in secolul XVIII de catre
marchizul Pierre Simon de Laplace, adept al astrofizicii lui Isaac
Newton (in acceptia newtoniana "lumina este compusa din corpusculi ce
se supun gravitatiei"), si elaboreaza conceptul de "viteza de
eliberare" (viteza pe care trebuie sa o aiba materia pentru a iesi din
campul gravitational al unui corp cosmic) in relatie cu teoria sa
conform careia exista corpuri total invizibile. Pe de alta parte, Karl
Schwarzchild a intuit in 1916 existenta corpurilor cosmice care nu
emit radiatii.

Nivel: Liceu
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Materia: Matematica


Ce este o gaura neagra? O gaura neagra esteo regiune a spatiului de care nimic nu poate scapa, nici chiar lumina.
Pentru a putea intelege mai bine, imaginati-va ca aruncati o minge de tenis in aer. Cu cat o aruncati mai tare cu atat mai rapid se va deplasa mingea si va ajunge mai sus inainte de a se intoarce. Daca o aruncati destul de tare ea nu se va mai intoarce,

Alte referate despre: universul, universul si sistemul solar, dictionarul este un univers in ordine alfabetica

Astronomie - dimensiunile universului si stelele

Mecanismul exact al formării rămîne încă învăluit în mister. Astronomii au elaborat teoria Big Bang pornind de la analiza luminii emise de galaxii. Cu excepţia celor apropiate, lumina lor ajunge la noi cu o tentă roşiatică. Razele spectrului lor, în loc să se afle în poziţia normală, sunt sistematic decalate spre roşu.

Alte referate despre: astronomie dimensiunile stelelor, dimensiunile universului, dimensiunea universului


Suma a doi vectori este dată de diagonala paralelogramului construit de cei doi vectori componenţi ca laturi având originea comună cu acesta. b) Metoda analitica – pp. scrierea analitica a unui vector.
- pp. sa cunoaştem descompunerea unui vector după două direcţii date

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Triunghiul Bermudelor

Triunghiul Bemudelor reprezinta spatiul marin, de forma triunghiulara,
situat în Oceanul Atlantic, cuprins între Insulele Bermude, Puerto
Rico si Peninsula Florida. Denumit si Triunghiul Diavolului, acesta a
devenit un subiect de mare interes începând cu secolul a XIX-lea. La
acea vreme, marinarii se temeau de aceasta zona, despre care se
povesteste ca "înghitise" numeroase vase.

Alte referate despre: triunghiul bermudelor, triunghiul bermudelor referat, referat triunghiul bermudelor

Primele calatorii in spatiul cosmic

Ulterior sondele au aterizat pe Luna au furnizat informatii mai precise despre suprafata acestia. Mai tarziu satelitii plasati pe orbita in jurul Lunii au fost studiati si fotografiati timp de mai multe luni. In cele din urma omul insa-si a pasit pe Luna. Intre 1969 si 1972 sase zboruri efectuate de navala spatiale Apollo au permis ca 12 astronauti americani sa paseasca pe Luna ei au fost Neil Armstrong si Eorvin Aldrin, pe 20 iulie 1969 in timpul zborului efectuat de Apollo 11, astronautii misiunii au instalat pe suprafata acesteia instrumente stintifice, au efectuat diverse masuratori si au adus pe Pamant pentru analiza aproape 400 kg de roci selenare.

Alte referate despre: primele calatorii in spatiul cosmic, referate fizica primele calatorii in spatiul cosmic, calatorii in spatiul cosmic

Universul si Sistemul Solar

În 1609 Galileo Galilei a construit un mic telescop de refracţie şi a descoperit că Venus, la fel ca Luna are faze, ceea ce indică că se roteşte în jurul Soa-relui. De asemenea el a descoperit pa-tru sateliţi naturali ai lui Jupiter şi inelele lui Saturn. El s-a născut în 1564 şi a fost unul dintre cei mai mari fizicieni şi astro-nomi din epoca Renaşterii. El a descoperit legea inerţiei, legea căderii corpurilor, legea compunerii mişcărilor.

Alte referate despre: universul si sistemul solar referat, referat universul si sistemul solar, legatura dintre evolutia universului a sistemului solar si a terrei

Robin Hood and the Black Cloak

The story goes that one day the Sheriff’s men caught Will Scarlet, one of Robin Hood’s outlaws, and took him to the Sheriff of Nottingham. ‘We’ve caught one of Robin Hood’s men,’ said one of them. The Sheriff, who was green with envy because all the people loved Robin Hood, said ‘Take him to the gallows in the market square tomorrow! Let people see what happens to Robin Hood’s companions!’

Alte referate despre: robin hood and the black cloak, robin hood and the black cloak rezumat, rezumat robin hood and the black cloak

Robin Hood and the Black Cloak

Robin Hood was having dinner with his friends in Sherwood Forest when he heard the bad news. He thought of a plan to rescue his friend. ‘We are on the Sheriff’s back list. He will have no mercy for Will. We must save him before it is too late’. Early the next morning he started out for Nottingham together with his youngest and strongest men. They all wore long coats over their green clothes. Under their coats they carried swords or bows and arrows.

Alte referate despre: robin hood and the black cloak summary, robin hood and the black cloak in romana, robin hood and the black cloak idei principale

Ploiesti - the city of black gold

At first, the municipality did not have premises of its own, renting various buildings. Later on they afforded to get two buildings constructed. The first one (“THE OLD TOWN HALL”), which used to be situated on the present – day “Prahova” Hotel, housed the Town Hall between 1868 – 1894. It was demolished after 1940. Between 1894 – 1972 the Town Hall was to be found in the “New Town Hall“. The edifice, designed to become a museum of the city after 1972, had to be demolished after the 1977 earthquake. Since 1972, the Town Hall has carried out its activity in the building of the Administrative Palace. Besides this building, the public services carry out their activity in other premises as a result of the development and diversification of the activity: inside the Central Market – which has been administrated by the municipality since 1997 – the Patrimony Board and the Fiscal Board carry out activity; the former house of the mayor Radu Stanian which has became the Weddings ...

Alte referate despre: ploiesti - the city of black gold in romana, ploiesti city, my city ploiesti


I don't doubt her sincerity when she says that she is a follower of the religion she describes. However, I believe that most of what she has written is just so much nonsense. It is exactly the sort of airy speculation that passed for anthropology at about the turn of the century. As a matter of fact, the religion she follows is probably no older than that and bears no relation to actual witchcraft.

Alte referate despre: witchcraft, mathamatical witchcraft

Beyond the civilisation

This is how my story goes. Let`s go back in the summer of 1999. My firts billion was made and it was time to celebrate this. By having thys amount of mouny one of my dreams from childhood becam a reality, having my own yacht. It was a dream day when i first made a ride in the Black Sea. Since than I feld in love with it.
To celebrate that firts billion in my buissnes carier I planed with a few friends to make a trip from The Black Sea to Monaco and Ibiza. We did all, the plan was ready, we got provisons for the journy and every thing was going to go perfectly.
We left the SHORE in a hot day, I think it was 35oC, a perfect day to sale. We went to Bulgarian shoreand we passed teh Bosfor Chanel. First night we had spend it in a Greek port. Near it it was a small village. It was very beautiful and full with shops, retaruants and ...

Alte referate despre: culture et civilisation francaise, the culture and civilisation of england, civilisation

Panda Bear

It is the most known and the rarest species of animals in the whole world. In liberty, there are some individuals but in the last years, the people from the nature protection, have made significant efforts to help them. After some estimations in present, there are about 700 individuals in liberty, and about 120, in zoos. Panda bear is so known and popular in the whole world, because it has an attractive aspect and it’s very easy to be recognized. His constitution is fat, specific for bears; the fond color is white, and the feet, shoulders and the chest are black; the fur is also black in the ears area and around the eyes.

Alte referate despre: panda bear, the panda bear, about panda bear

Alice in Wonderland

In this short, introductory chapter we are introduced to Alice, a young girl, who is sitting on the bank of a river with her older sister. Alice is bored and a bit sleepy, but she is startled awake by a talking White Rabbit who hops by with a pocket watch. Alice follows the rabbit down his rabbit hole, but loses him almost immediately. The hole is quite deep and Alice falls for a relatively long time. During the fall she notices that the hole is lined with cupboards filled with things. She also talks to herself as she falls. Upon reaching the bottom of the rabbit hole Alice catches up with the rabbit just long enough to see him scurry off, complaining about how late he is.

Alte referate despre: alice in wonderland rezumat, rezumat alice in wonderland, alice in wonderland referat

African american history

Portuguese traders brought the first African slaves for agricultural labor to the Caribbean in 1502. From then until 1860, it is estimated that more than 10 million people were transported from Africa to the Americas. The great majority were brought to the Caribbean, Brazil, or the Spanish colonies of Central and South America. Only about 6 percent were traded in British North America.

Alte referate despre: african american history referat, du sable museum of african-american history, british and american history


he most extensive plains are the lowlands of Walachia, located between the Transylvanian Alps and Bulgaria, and the region of Moldova (Moldavia), east of the Carpathian Mountains. Bordering the Black Sea in the extreme east and forming part of Dobruja, or Dobrogea, is a low plateau, which continues south into Bulgaria.

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If you have a plume at your bike or car you can go the vulcanization on the Cosbuc street. There are the smallest prices on the market.
Do you want to make some shopping ? You can go the Braille street. There are a lot of shops there. You can buy all clothes or shoes or trainers or caps you need. The prices are a little bit expensive but they deserve them because they are of the best quality.
Do you want to buy some sprts articles? A bike or roller skates or evrething of this kind? You can go to Sports Center. The prices there are very expensive but the items there of are very good quality.
If you need to buy some aliments you can go to Slabero on the Cordon Street. The prices there are reasonable. You can buy items with the table tickets.

Alte referate despre: orasul galati, galati, istoria orasului galati
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