Tara luanei

Uite un articol interesant:
http://www.ziarulcn....ticle&aid=10866

  A fost cineva prin zona? A avut o astfel de experienta?
Ce parere aveti? este posibil asa ceva?

n-acitit tot, asa ca& nu ma pronunt.

la prima vedere, pare o mare prostie... MARE de tot.

Citez din articolul cu pricina:
"Ceea ce a povestit pare fantastic. A fost aspirat intr-un tunel turbionar, gri, la capatul caruia se afla o lumina stralucitoare. „Clasic“, s-ar putea spune. Asa se „vede“ si din starea de coma. Insa este pentru prima data cand cineva explica aceasta lumina stralucitoare. „Este vorba de o radiatie luminoasa pe care o apreciez avand 300.000 de grade Kelvin“. Ar fi fost suficient atat sa-i tulbure pe participantii la experiment. Insa subiectul mai avea si alte „amintiri“".


Mi-a tras atentia "300.000 de grade Kelvin" si ma mir ca nu a zis 299 000 sau 297.459,,,

si daca-s kelvin ce-i? suna mai interesant? kelvin sau celsius e tot un drac daca e vorba de 300.000

Cind te referi la Kelvin spui simplu 3 Kelvin si nu 3 grade Kelvin, cind te referi la Celsius spui -270 grade Celsius. Clar?
De unde ai scos 300.000 Kelvin, nu stiu.. Dar 3 Kelvin iti spune ceva?
Intrebare: Care este una dintre cele 41 de anomalii ale apei? Sau altfel spus de ce densitatea maxima a apei se atinge in jurul a 3 grade si ceva Celsius si nu cind apa e sub forma de gheata?

Edited by zippy99, 19 November 2004 - 13:08.

iar a venit acceleratu ezoteric pe linga linie. 300.000 e scos de pe sait. anomalia apei nu exista. anomalia pipi este cind pipiul atinge temperatura maxima adica exact in momentul in care iasa de pe teava.

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anomalia apei nu exista
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Pai cum sa existe la tine cind confunzi apa cu berea..
Esti varza de post..

bai zippy, acuma io te intreb serios: tu stii ce-i aia densitate?

http://www.simetric.co.uk/si_water.htm

vrei sa spui ca linku ala reprezinta densitatea?

Da ce sintem la ora de chimie dom' profesor? Eu te-am intrebat ceva..
Stiu de o zona pe linga Bacau unde cimpul magnetic prezinta grave anomalii, unii spun ca masinile urca la deal, etc.. Probabil o fi vreun minereu de ceva feroase pe acolo.. Nu stiu..

Edited by zippy99, 19 November 2004 - 14:19.

nu mai levita printre idei, lasa cimpul magnetic, si spune tu mai bine de ce e desitatea maxima a apei la 3 grade anomalie? ce e atit de anomalic? de ce ar trebui sa fie maxima cind ingheata?

Pentru ca un corp solid este mai dens decit un lichid (ma refer la acelasi corp).. Anomalia asta este: de ce nu are apa densitatea maxima in starea solida (gheata) ci in starea lichida?

Edited by zippy99, 19 November 2004 - 14:33.

zippy99, on Nov 19 2004, 14:04, said:

  vezi ca la Bacau e o iluzie optica , a fost verificata cu aparate de masura topo si sa constatat ca de fapt drumul in realitate coboara si nu urca, deci masinile vin la vale singure.

zippy99, on Nov 19 2004, 13:00, said:

lasam alealate 40 de anomalii deoparte si ne ocupam in continuare de a 41-a. eu sint un pic dezamagit pentru ca nu dai tu raspunsul singur la o intrebare pusa atit de misterios: de ce nu are apa densitatea maxima in stare solida ca celelalte substante mai fraiere? pentru ca asa a vrut gange si brahmaputra

De ce? Si asta il vezi tot un mister? E un fapt..
Un mister poate fi asta: 1g de materie dintr-o gaura neagra cintareste cit o locomotiva pe Pamint.. Sa nu-mi spui ca nu e vorba de densitate ci de altceva..

misterioase sint caile domnului, fiule! desi nu e nici un mister ca inca n-a fost nimeni intr-o gaura neagra sa aduca cu lingurita 1 gram (sic!) de materie si s-o compare cu locomotivele. faci o mare confuzie intre termeni. 1 gram nu poate cintari cit o locomotiva nici pe pamint, nici aiurea.

dublulol  :lol:  :lol: in gaura neagra nu se poate defini densitatea pentru ca nu exista nici un volum.

pina la urma e vorba de altceva, nu de densitate huhuhu io zic sa ramii la meditatie si sa nu mai incerci sa freci gaurile negre in cautarea locomotivelor din lingurita. she blinded me with science  :death:

Tu-mi zici ca nu exista volum de parca ai incerca sa-mi spui ca dB este o unitate de masura. S-au facut calcule si asta a reiesit 1 g de materie dintr-o gaura neagra cintareste cit o locomotiva pe Pamint.. Nu e nici un SF.. Iar esti intr-o confuzie.. De ce lumina nu poate ,,scapa" dintr-o gaura neagra? De unde stii tu ca nu exista volum intr-o gaura neagra? O gaura neagra nu este ceva punctiform, infinitezimal sau mai stiu eu ce.. Are totusi dimensiuni.. Este ceea ce ramine dintr-o stea supermasiva..

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What is the volume of a black hole?

The Answer
Our intuitive sense of volume breaks down in the strong gravitational region in a black hole. So while the "size" of a black hole is given by the radius of its event horizon, it's volume is not determined by the usual 4/3*pi*r3. Instead, relativity makes it more complicated than that. As you pass the event horizon, the spatial direction 'inwards' becomes 'towards the future'-- you WILL reach the center, it's as inevitable as next Monday. The direction outsiders think of as their future becomes a spatial dimension once you are inside. The volume of a black hole, therefore, is its surface area times the length of time the hole exists (using the speed of light to convert from seconds to meters). Since a black hole last practically forever, the black hole's volume is almost infinite. (This is also a way of explaining the fact that you can pour stuff into a black hole forever and never fill it up. Another reason why black holes never fill up is that the radius of the event horizon increases as the mass of the black hole increases.)
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Black Holes: What Are They?
Black holes are the evolutionary endpoints of stars at least 10 to 15 times as massive as the Sun. If a star that massive or larger undergoes a supernova explosion, it may leave behind a fairly massive burned out stellar remnant. With no outward forces to oppose gravitational forces, the remnant will collapse in on itself. The star eventually collapses to the point of zero volume and infinite density, creating what is known as a " singularity ". As the density increases, the path of light rays emitted from the star are bent and eventually wrapped irrevocably around the star. Any emitted photons are trapped into an orbit by the intense gravitational field; they will never leave it. Because no light escapes after the star reaches this infinite density, it is called a black hole.
But contrary to popular myth, a black hole is not a cosmic vacuum cleaner. If our Sun was suddenly replaced with a black hole of the same mass, the only thing that would change would be the Earth's temperature. To be "sucked" into a black hole, one has to cross inside the Schwarzschild radius. At this radius, the escape speed is equal to the speed of light, and once light passes through, even it cannot escape.

The Schwarzschild radius can be calculated using the equation for escape speed.


vesc = (2GM/R)1/2, (Vesc inseamna V indice esc)
For photons, or objects with no mass, we can substitute c (the speed of light) for Vesc and find the Schwarzschild radius, R, to be

R = 2GM/c2
If the sun was replaced with a black hole that had the same mass as the sun, the Schwarzschild radius would be 3 km (compared to the sun's radius of nearly 700,000 km). Hence the Earth would have to get very close to get sucked into a black hole at the center of our solar system.

Since black holes are small (only a few to a few tens of kilometers in size), and light that would allow us to see them cannot escape, a black hole floating alone in space would be hard, if not impossible, to see.

Edited by zippy99, 19 November 2004 - 16:11.