Felix Baumgartner danas skače sa 35+km!

Srđan Pavlović:  Ta dijabola koja leti ne proizvodi zvuk, ali se krece nadzvucnom brzinom i jasno se cuje prasak probijanja zvucnog zida dijabole, nesto slicno onom "plasljivcu" pistolju sa onim crvenim kapislama.

milivoje t:
ovo je ipak podvig coveka, jer treba naci nekog dovoljno ludog i dovoljno sposobnog da se baci sa te visine i kontrolisano prizemlji.

Java Beograd: Kad (u kom momentu) jasno čuješ prasak probijanja zvučnog zida kod ispaljivanja dijabole ?

Kad (u kom momentu) jasno čuješ prasak probijanja zvučnog zida kod ispaljivanja dijabole ?

Ja nisam čuo kad bih ja pucao

Vasastajić: Voleo bih da mi ovde prisutni autoriteti pojasne razlike između ove i ove fizičke pojave.
Hvala!

Srđan Pavlović:


Pa neposredno nakon opaljivanja... jace vazdusne puske ispaljuju dijabolu
brze od 343 m/s i onda imas taj prasak, bas se lepo cuje.

milivoje t: mislim da rusi civilima jos uvek iznajmljuju svoje migove 25, koji su jedini sposobni avioni da vas dovedu na tu visinu...

shadow-bg:


Nema razlike. Prva je narodni izraz za drugu. Razlika je u terminologiji.

Java Beograd: Da li ti je, možda, samo malo, onako usput, palo na pamet da je to što se čuje ustvari oslobađanje sabijenog vazduha u cevi. Onaj isti vazduh koji je sabijen pa iskorišćen za ispaljivanje dijabole. Dakle, Ista fizička pojava koja prati i otvaranje flaše šampanjca. (Ako se unapred složimo da čep šampanjca ne probija zvučni zid).

Any projectile moving through the air at a velocity greater than the speed of sound (332 to 340 m/s or 1,089 to 1,114 fps in dry, 18 C or 65 degree F air, depending on who one listens to) will create a supersonic crack. Temperature, humidity and atmospheric pressure variations play a role in raising or lowering the speed of sound by a small percentage. In a firearm which lacks a substantial muzzle report (being fired over an open field) the sound resembles the loud tearing of a bed sheet.

Two sounds are actually created, one from the front of the bullet, and one from the rear. Near trees and buildings the sound waves come back as a distinct crack or pop each time the speeding bullet passes some object with a vertical, reflective surface. Once the muzzle report has been diminished the supersonic boom becomes dominant. Curiously, the sounds will now appear to come from the target area, rather than the rifleman's position. Sound moves through our atmosphere at a relatively fixed rate. A sound wave will typically strike one ear a bit before the other.

The human brain is capable of detecting the difference in time between sound impacting one ear and then the other in an increment of as little as one/six-millionth of a second. With time and practice we soon learn to use this ability to pinpoint the source of a sound very accurately. Because a suppressed muzzle report is relatively quiet, the uninitiated will automatically home in on the loudest sound, which in this case is a sonic boom reflecting from the target area. The intense, sharp sound of the bullet's passage will seem much louder than the muzzle report to someone close to the flight path. Indeed, a rapidly moving .308 bullet will sound louder than a .22 LR pistol, to someone who is positioned a few feet from its flight path.

Smaller diameter bullets make less noise than larger diameter bullets. Supersonic is supersonic. A bullet traveling 366 m/s or 1,200 fps will make about the same noise as one traveling 1220 m/s or 4,000 fps. Projectiles that are .308 inch in diameter will be somewhat louder than .223 bullets. There is no technology which can remove the sound of a supersonic projectile, no matter what claims are made to the contrary.

"Sve je marketing“, rekao je sponzor, osnivač Red Bula i jedan od zaslužnih za misiju "Red Bul Stratos" Diter Matešic.

Uloženih 50 miliona evra donelo je neverovatnih 12.000 odsto dobiti, istakao je analitičar robnih marki Gerhard Hrebiček bečkom dnevniku “Esterajh”.

Matešic je, kako konstatuje list, još jednom dokazao kako funkcioniše marketing.

"Red Bul" namerava da ima i dugoročne koristi od istorijskog skoka. Tako je Eurobrend procenio da je vrednost Red Bula bila do sada oko 14 milijardi evra, a nakon skoka je vrednost ove marke skočila na 17 milijardi evra.