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The fastest manmade object isn't a hypersonic jet or spacecraft, but a large manhole cover.... When the US started doing underground nuclear testing, nobody really knew what would happen. One test bomb was placed at the bottom of a 485-foot deep shaft on July 26, 1957, and someone thought it was a good idea to put a half-ton iron manhole cover on top to contain the explosion. The bomb turned the shaft into the world's largest Roman candle, and the manhole cover was nowhere to be found. Robert Brownlee, an astrophysicist who designed the test, wanted to repeat the experiment with high-speed cameras so he could figure out what happened to the cover. So another experiment was created, this time 500-feet deep, and a similar half-ton manhole cover was placed on top. On August 27, 1957, they detonated the bomb. The high-speed cameras barely caught a view of the cover as it left the top of the shaft and headed into oblivion. Brownlee used the frames to calculate the speed to be more than 125,000 miles per hour.... more than five times the escape velocity of the Earth, and the fastest man-made object in history.
Physicists have debated the whereabouts of the two manhole covers ever since. Recently, with the help of supercomputers and a lot more scientific knowledge, physicists are certain that they wouldn't have had time to burn up completely before exiting the atmosphere. This means both of the remaining pieces would have passed Pluto's orbit sometime around 1961 and are way beyond the edge of the solar system by now.




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ea
 ea      06.01.2021 - 09:56:03 , level: 1, UP   NEW
a dekel isol het

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anything
 anything      06.01.2021 - 10:24:25 [13K] , level: 2, UP   NEW

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michalides
 michalides      07.01.2021 - 09:52:50 , level: 3, UP   NEW
hned by som si to pozrel

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Ferchi
 Ferchi      07.01.2021 - 14:27:11 , level: 4, UP   NEW
kamo v povodnom svk dabingu to bolo skvele!

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ksyz
 ksyz      05.01.2021 - 21:29:46 , level: 1, UP   NEW
a teraz si predstav to okamzite zrychlenie z 0 na "six times the escape velocity from earth". z toho dekla by nic nezostalo, zmenil by sa na horucu paru ocele.

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Tomáš, to sa vie
 Tomáš, to sa vie      06.01.2021 - 09:24:45 (modif: 06.01.2021 - 09:25:15), level: 2, UP   NEW !!CONTENT CHANGED!!
Predstavit si to viem, lenze v ziadnom z clankov postovanych v tomto vlakne nieco take nebolo ani len naznacene
Tak snad pani astrofyzici neurobili taku skolacku chybu
Nuclear bombs can’t melt iron manhole covers

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ksyz
 ksyz      06.01.2021 - 18:37:45 , level: 3, UP   NEW
akoze dekel pri plute je sice pekna a romanticka predstava, ale je to hoax.

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Tomáš, to sa vie
 Tomáš, to sa vie      06.01.2021 - 22:48:02 , level: 4, UP   NEW
Ok sak daj plz nejaky link

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ksyz
 ksyz      07.01.2021 - 09:21:46 [1K] , level: 5, UP   NEW
https://io9.gizmodo.com/no-a-nuclear-explosion-did-not-launch-a-manhole-cover-1715340946

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randlover
 randlover      07.01.2021 - 00:00:49 , level: 5, UP   NEW
http://nuclearweaponarchive.org/Usa/Tests/Plumbob.html

This is about five times Earth's 11.2 km/sec escape velocity, quite close to the figure of six times arrived at by Dr. Brownlee in his detailed computations.
But the assumption that it might have escaped from Earth is implausible (Dr. Brownlee's discretion in making a priority claim is well advised). Leaving aside whether such an extremely hypersonic unaerodynamic object could even survive passage through the lower atmosphere, it appears impossible for it to retain much of its initial velocity while passing through the atmosphere. A ground launched hypersonic projectile has the same problem with maintaining its velocity that an incoming meteor has. According to the American Meteor Society Fireball and Meteor FAQ meteors weighing less than 8 tonnes retain none of their cosmic velocity when passing through the atmosphere, they simply end up as a falling rock. Only objects weighing many times this mass retain a significant fraction of their velocity.

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asety
 asety      07.01.2021 - 00:47:25 , level: 6, UP   NEW
smerom hore sa atmosfera zredsuje takze to nie je uplne rovnake ako meteor

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ksyz
 ksyz      07.01.2021 - 09:28:01 , level: 7, UP   NEW
je to fakt raketova veda.
raketa postupne zrychluje. ma vlastny pohon.
dekel dostal supu (shock wave), nema vlastny pohon, korekciu smeru, ziadnu aerodynamiku.

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randlover
 randlover      07.01.2021 - 10:55:45 [1K] , level: 8, UP   NEW
Ako vždy nás asi rozsúdi len praktický experiment. Vedel by som zohnať dekel a kedysi som prispel na V3S (na prevoz bomby). Mám aj studňu, ale radšej by som to robil niekde inde. Ja hovorím, poďme do toho

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pilier
 pilier      08.01.2021 - 12:07:31 , level: 9, UP   NEW
Este bude treba uran do studne nasypat.

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ksyz
 ksyz      07.01.2021 - 11:01:13 , level: 9, UP   NEW
byt to take jednoduche, dnes sa ostrelujeme deklami :)

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huno
 huno      05.01.2021 - 17:09:25 [2K] , level: 1, UP   NEW

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ch
 ch      05.01.2021 - 16:57:57 , level: 1, UP   NEW
https://blogs.nasa.gov/parkersolarprobe/2018/10/29/parker-solar-probe-becomes-fastest-ever-spacecraft/

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pilier
 pilier      05.01.2021 - 11:31:03 [5K] , level: 1, UP   NEW
There’s an urban legend that dates back to when the US was testing nuclear bombs underground, one of the bombs tested had its strength miscalculated, causing the welded manhole cover to be launched with so much force that the it reached 6 times the speed of Earths escape velocity (which is 25,000 Mph). Curious about which man-made objects have reached the fastest speed, we’ve visualised out findings!
https://www.jpl.nasa.gov/infographics/infographic.view.php?id=11489

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Tomáš, to sa vie
 Tomáš, to sa vie      05.01.2021 - 11:49:22 , level: 2, UP   NEW
Tak ale nie je to urban legend, ci?

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pilier
 pilier      05.01.2021 - 12:23:07 [1K] , level: 3, UP   NEW
K tomuto som sa dopatral http://nuclearweaponarchive.org/Usa/Tests/Brownlee.html

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randlover
 randlover      05.01.2021 - 11:58:56 , level: 3, UP   NEW
možno v tej časti, že to je najrýchlejší objekt?

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jolly good
 jolly good      05.01.2021 - 00:39:51 [10K] , level: 1, UP   NEW
ujebalo dekel

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your biggest fan[Locked_OUT]
 your biggest fan[Locked_OUT]      05.01.2021 - 00:21:57 , level: 1, UP   NEW
nezhorelo ci dolespadlo?

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Du
 Du      05.01.2021 - 09:09:55 , level: 2, UP   NEW
mezhorelo