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• #34952
Art is the sex.
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• #34954
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• #34955
his mufukkka can haz all da canca
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• #34956
i sincerely hope i misunderstood whatever you tried to convey with that message
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• #34957
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• #34958
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• #34959
[Relativistic Baseball
](http://what-if.xkcd.com/1/) What would happen if you tried to hit a baseball pitched at 90% the speed of light?
- Ellen McManis
Let’s set aside the question of how we got the baseball moving that fast. We'll suppose it's a normal pitch, except in the instant the pitcher releases the ball, it magically accelerates to 0.9c. From that point onward, everything proceeds according to normal physics.:
The answer turns out to be “a lot of things”, and they all happen very quickly, and it doesn’t end well for the batter (or the pitcher). I sat down with some physics books, a Nolan Ryan action figure, and a bunch of videotapes of nuclear tests and tried to sort it all out. What follows is my best guess at a nanosecond-by-nanosecond portrait:
The ball is going so fast that everything else is practically stationary. Even the molecules in the air are stationary. Air molecules vibrate back and forth at a few hundred miles per hour, but the ball is moving through them at 600 million miles per hour. This means that as far as the ball is concerned, they’re just hanging there, frozen.
The ideas of aerodynamics don’t apply here. Normally, air would flow around anything moving through it. But the air molecules in front of this ball don’t have time to be jostled out of the way. The ball smacks into them so hard that the atoms in the air molecules actually fuse with the atoms in the ball’s surface. Each collision releases a burst of gamma rays and scattered particles.
These gamma rays and debris expand outward in a bubble centered on the pitcher’s mound. They start to tear apart the molecules in the air, ripping the electrons from the nuclei and turning the air in the stadium into an expanding bubble of incandescent plasma. The wall of this bubble approaches the batter at about the speed of light—only slightly ahead of the ball itself.
The constant fusion at the front of the ball pushes back on it, slowing it down, as if the ball were a rocket flying tail-first while firing its engines. Unfortunately, the ball is going so fast that even the tremendous force from this ongoing thermonuclear explosion barely slows it down at all. It does, however, start to eat away at the surface, blasting tiny particulate fragments of the ball in all directions. These fragments are going so fast that when they hit air molecules, they trigger two or three more rounds of fusion.
After about 70 nanoseconds the ball arrives at home plate. The batter hasn't even seen the pitcher let go of the ball, since the light carrying that information arrives at about the same time the ball does. Collisions with the air have eaten the ball away almost completely, and it is now a bullet-shaped cloud of expanding plasma (mainly carbon, oxygen, hydrogen, and nitrogen) ramming into the air and triggering more fusion as it goes. The shell of x-rays hits the batter first, and a handful of nanoseconds later the debris cloud hits.
When it reaches the batter, the center of the cloud is still moving at an appreciable fraction of the speed of light. It hits the bat first, but then the batter, plate, and catcher are all scooped up and carried backward through the backstop as they disintegrate. The shell of x-rays and superheated plasma expands outward and upward, swallowing the backstop, both teams, the stands, and the surrounding neighborhood—all in the first microsecond.
Suppose you’re watching from a hilltop outside the city. The first thing you see is a blinding light, far outshining the sun. This gradually fades over the course of a few seconds, and a growing fireball rises into a mushroom cloud. Then, with a great roar, the blast wave arrives, tearing up trees and shredding houses.
Everything within roughly a mile of the park is leveled, and a firestorm engulfs the surrounding city. The baseball diamond is now a sizable crater, centered a few hundred feet behind the former location of the backstop.
A careful reading of official Major League Baseball Rule 6.08(b) suggests that in this situation, the batter would be considered "hit by pitch", and would be eligible to advance to first base.
- Ellen McManis
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• #34960
Is this aimed at DJ?
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• #34961
It's aimed at BMXers who used those part to make their heavy bike slightly less heavy.
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• #34962
[Relativistic Baseball
](http://what-if.xkcd.com/1/) What would happen if you tried to hit a baseball pitched at 90% the speed of light?
- Ellen McManis
Let’s set aside the question of how we got the baseball moving that fast. We'll suppose it's a normal pitch, except in the instant the pitcher releases the ball, it magically accelerates to 0.9c. From that point onward, everything proceeds according to normal physics.:
The answer turns out to be “a lot of things”, and they all happen very quickly, and it doesn’t end well for the batter (or the pitcher)...
Seeing as you did link to the original, this much ^ would have been enough. As you plagiarised it in full without actually stating it wasn't yours you could have not bothered with the link.
- Ellen McManis
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• #34963
It says who wrote it, even in your quoted bit
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• #34964
No, it says who asked the question. There's no licensing page on what-if.xkcd.com so you don't have permission to reproduce the content. On the internet does not imply public domain.
If you're gonna steal, steal from The Man.
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• #34965
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• #34966
sorry if a re, but can't be a to check
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• #34968
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• #34969
No, it says who asked the question. There's no licensing page on what-if.xkcd.com so you don't have permission to reproduce the content. On the internet does not imply public domain.
If you're gonna steal, steal from The Man.
It's obviously a phd comic
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• #34970
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• #34971
There's no licensing page on what-if.xkcd.com
It says "Copyright ©2012 xkcd", which links to
This work is licensed under a Creative Commons Attribution-NonCommercial 2.5 License.
This means that you are free to copy and reuse any of my drawings (noncommercially) as long as you tell people where they're from.
That is, you don't need my permission to post these pictures on your website (and hotlinking with is fine); just include a link back to this page. Or you can make Livejournal icons from them, but -- if possible -- put xkcd.com in the comment field. You can use them freely (with some kind of link) in not-for-profit publications, and I'm also okay with people reprinting occasional comics (with clear attribution) in publications like books, blogs, newsletters, and presentations. If you're not sure whether your use is noncommercial, feel free to email me and ask (if you're not sure, it's probably okay).
He included a link to the source, so he seems to have complied with the licence terms.
But leaving that aside, wtf is it doing in the memes thread?
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• #34972
It's obviously a phd comic
Or one of those things
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• #34973
Would anyone capable of launching a baseball at 0.9c really care about a bit of fire and plasma?
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• #34974
Would anyone with the ability to launch a baseball at 0.9c waste that ability by launching a baseball of all things?
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• #34975
I would think that the "pitch" event would have more cataclysmic effects than the flight and arrival of the ball.
lol