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- cross-posted to:
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Maybe it desintegrated and thus vanished from the consecutive frame?
Atomic blasts are kind of powerful versus an iron lid.
Man. I haven’t seen an ifunny logo in so long. Are people still on it?
The calculation of its speed was made by high speed camera, as you’ve probably seen the Mythbusters do. In this case the manhole cover was seen in flight in precisely one frame of high speed camera footage, and for it to go “installed, in flight, gone” in three frames means it would have had to be moving at mach jesus.
It likely didn’t make it to space intact; it would have had ultrasonic compression heating on one side and a nuclear explosion on the other. It’s probably still here in the form of iron oxide dust scattered about the Northwestern hemisphere.
In my head I know you’re right but my heart wants this.
If we kill him he never will have said it and the manhole cover will be in space.
I like the energy.
As much energy to put a manhole in space?
As much energy to put a man, whole, in space
You’ll have to kill Kyle Hill too.
That I’d do for free.
I’d like to think that it’s possible that it was launched fast enough that it escaped the blast and Earth’s atmosphere and made its way to a neighboring galaxy where it’s now living lodged in some far off asteroid or some comet or planet.
Manhole cover first man made object in Andromeda.
This was in what? the 50’s? So it would have had to travel ~2 million light years in 70 years, so it would have had to hit several hundred thousand times the speed of light?
RIP jpgd to death
Slightly less recompressed version: https://imgur.com/2UHiL4r
Definitely easier to read thx
ifunny.c😀
The Parker Solar Probe moves 120 miles per second as it passes around the Sun. That’s nearly half a million miles per hour!
Parker Solar Probe: 191 km per second.
Nuclear Manhole Cover: 55 km per second
Voyager 1: 17 km per second
Voyager 2: 15 km per second
Nope, it would just have bursted due to thermal schock and pressure. Escape velocity, what are you dreaming, is the lid made of tungsten?
This is the origin apparently.
RRB: “My calculations are irrelevant on this point. They are only valid in speaking of the shock reflection.” Ogle: “How fast did it go?” RRB: “Those numbers are meaningless. I have only a vacuum above the cap. No air, no gravity, no real material strengths in the iron cap. Effectively the cap is just loose, traveling through meaningless space.” Ogle: And how fast is it going?" This last question was more of a shout. Bill liked to have a direct answer to each one of his questions. RRB: “Six times the escape velocity from the earth.”
Ummm, not sure where they got these numbers from but Earth’s escape velocity is not 7000mph and escaping the sun’s gravitational pull (leaving the solar system from Earth) is not 30,000mph. Respectively the numbers are approximately 25,000mph and 94,000mph. You’re welcome.
94000mph is relative to the sun’s surface. Relative to the Earth’s surface, it is around 37000mph, which means they were still wrong.
That’s 11.2 km/s and 42.1 km/s.
Also, even if the manhole cover was going at above 12 km/s the trajectory has to be right for that to result in orbit. Most paths it would take would result in it going up and then coming back down again. Similarly, if somehow it did manage more than 50 km/s and wasn’t destroyed in the atmosphere, it might have the velocity to escape the sun’s gravity, but probably wouldn’t be on the right path to do it. Most likely it would fall into the sun.
So, assuming the 125,000 mph (55 km/s) velocity is correct, the most likely outcome is that it was a reverse-meteor, something that burned up going up through the atmosphere, not down. And even if it did have enough speed to get out of the atmosphere, and there was enough of it left, it most likely fell right back down through the atmosphere somewhere else, either burning up on re-entry or hitting the ground (or the water) somewhere else.
Ignoring that it burned up and ignoring losses due to drag if it somehow didn’t. Isn’t the point of escape velocity that it explicitly won’t come back down.iar least not on earth. Your trajectory won’t matter as you have enough velocity to escape the gravity of earth and will orbit the sun. Further if you managed the solar system escape velocity you will end up orbiting the galactic core. Trajectory doesn’t matter if you have escape velocity. Correct trajectory just minimizes the delta v needed to reach that escape velocity.
At least that’s all my recollection.
Escape velocity means you could stay in orbit. It doesn’t guarantee anything if you launch at the wrong angle.
Gotta love Tumblr. Just massive amounts of disinformation and bullshit all the time.
Also it would have atomized.
yeah, and it is not “research” to check it. They literally teach it in primary school physics.
Not in our freedom schools!
I mean, what for? Knowing that number isn’t a life skill.
I like how they are implying the speed of light is only 500000mph (as opposed to 671,000,000 mph or 1,080,000,000kph)
?
Ah sorry, I should have specified that the post not only got the escape velocity wrong as you pointed out they also got the speed of light wrong near the end.
Surprised no one has posted this but Kyle hill made a video on it
This reminds me of that quote from Mass Effect:
“This, recruits, is a 20-kilo ferrous slug. Feel the weight! Every five seconds, the main gun of an Everest-class Dreadnought accelerates one to 1.3 percent of light speed. It impacts with the force of a 38-kiloton bomb. That is three times the yield of the city buster dropped on Hiroshima back on Earth. That means: Sir Isaac Newton is the deadliest son-of-a-bitch in space! (…) I dare to assume you ignorant jackasses know that space is empty! Once you fire this hunk of metal, it keeps going 'till it hits something! That can be a ship, or the planet behind that ship. It might go off into deep space and hit somebody else in ten thousand years. If you pull the trigger on this, you are ruining someone’s day, somewhere and sometime!”
That first mass effect can’t be beat for setting the stage and immersing you in the world.
I can hear the VA in my head lmao
Edit: I like mass effect I don’t have a good memory
That quote is not from the first one though, it’s from the second one
Balls exposed 🙀🙀🙀🙀
Citadel lobby, yes.
“What is Newton’s first law of motion?”
“No credit for partial answers!”
How to solve the Three Body Problem.
Ive seen this claim a dozen times. It’s a disc shape. How this thing isn’t going to start flipping and curving its trajectory, or just plain old running out of energy due to air resistance, and not making it out of earth’s atmosphere is beyond me.
Take a coin and trow it as hard as you can. The curving is not that much.
Throw it into water or gelatin. At thousands of metres per second the air is going to seem much more dense.
I don’t have the arm strength to trow anything at the speed needed to make your analogy work.
If it’s like a frisbee, yeah, but it still curves. Now start it spinning like spinning a coin on edge. The curving will be much more dramatic.
It didn’t stay solid upon initial blast impact. Probably didn’t even stay liquid.
Yeah it vanished because it vaporized.
I think they were able to track it for at least 2 frames, thus calculate it’s speed.
Nope, just one frame. Adds to the myth, when people don’t know the exact speed.
tbf the calculated speed is actually roughly the minnimum based on its starting position and the frame it appeared in. it could have actually been going even faster.
Pretty sure that’s not really true though.
One frame before the blast and one frame after, but semantics.
I don’t count having no visual indication of the object as “tracking” it, if we’re talking semantics. One frame could equal an even faster speed than what it would minimally take to cross the entire width of the image at some trajectory vector. For other vectors, it could be (much) less (like not passing straight through the image from on side to the opposite side, e.g.).
It’s important to not hang too hard on this as the escape speed is dependent on air resistance, or rather lack thereof. Those escape speed numbers are defined along with the assumption of zero air resistance or other forces acting on the object.
You can use the frame from before to calculate the MINIMUM speed. It could have been going even faster.
It isn’t speed.
lol what
Most likely it just evaporated, or disintegrated or something, but I think its pretty unlikely it survived that absolutely bonkers acceleration.
There is one detail wrong in the first post; that is not the lids speed but rather it’s minimum speed.
Unfortunately they got almost everything else wrong though. Mainly - the cover actually almost certainly just vaporiserd.
Notice, children, how the common apostrophe from lid’s migrated all the way to its.
Isn’t nature amazing?
What makes it more amazing is I understood without even noticing the mistake.
That’s assuming it crossed the image straight from edge to edge, though.
The cover obtained all of its energy from the blast, it can only go slower than its initial speed unless acted upon by another force.
No no, because they only had one frame of it moving, they can only calculate and upper and lower bound on it’s speed. The number given was the lower bound is what theyre saying.
Responding to the last comment in the image:
You could literally just do reverse Starship Troopers, the movie at least.
You’re a bunch of aliens and blam out of no where the nuclear launched manhole obliterates a holy site on your homeworld, your scientists track the trajectory back to Earth, conclude they must have launched it intentionally, and then launch an interstellar jihad against totally unaware Earthlings.
That reminds drag of Halo, though significantly more silly.
In Halo, the Covenant are on an interstellar crusade for holy artifacts left behind by the Forerunners. When they discovered the planet Harvest, inhabited by humans, they saw tons of artifacts on their scanners. So naturally, they landed on the planet and started blasting the humans to steal the artifacts. But the more humans they killed, the more artifacts disappeared from their monitors. The humans must be destroying the artifacts out of petty spite! What heresy!
The Prophet of Truth is curious about what kind of artifacts the humans have, so he goes to talk to an ancient Forerunner AI they have in storage, Mendicant Bias. Truth shows Bias the symbol that they keep seeing on human worlds. Bias says “You fool, you’ve got it upside down. Turn it around, see? It says Reclaimer. It means a person the Forerunners have chosen to inherit their empire. You’ve just been killing these humans? No wonder the reclaimers keep disappearing, you’re the one who’s doing it!”
So Truth realises that he’s been ordering his troops to kill what should rightfully be considered demigods by his religion, and who he should be worshipping. And he realises that if he reveals this information to the people, he and the other Prophets will lose all their political power since there are Actual Fucking Gods walking around. So naturally, Truth declares a Holy Genocide against humanity so that nobody will ever figure out that he’s guilty of Deicide and that their entire religious political structure is a lie.
You refer to yourself as “drag” in the third person, rather than just say “me”?
No, drag is using drag’s first person pronoun, drag.
Drag am using it?
Drag’s pronoun isn’t inflected like that.
Well that’s a drag.
Or, you just decided on first contact, but, suddenly, ship goes boom after being struck in the propulsion system with a bullet like manhole cover.
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