background preloader

Relativistic Baseball

Relativistic Baseball
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). The ball is going so fast that everything else is practically stationary. The ideas of aerodynamics don’t apply here. These gamma rays and debris expand outward in a bubble centered on the pitcher’s mound. 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. After about 70 nanoseconds the ball arrives at home plate. Suppose you’re watching from a hilltop outside the city.

http://what-if.xkcd.com/1/

Shakespeare Insult Kit Shakespeare Insult Kit Since 1996, the origin of this kit was listed as anonymous. It came to me on a piece of paper in the 90's with no attribution, and I thought it would make a cool web page. Though I searched for the origin, I could never find it. In 2014, Lara M informed found the originating author. It appears to be an English teacher at Center Grove High School in Greenwood Indiana named Jerry Maguire. Blog: Higgs Hysteria You know that a scientific idea has penetrated popular culture when people start making jokes about it. Like the one about the priest who changed his name to Higgs so he could be better at giving mass. Or some that say a gadget for negating the Higgs field would be a weapon of mass destruction.

Finally, the Hip Hop Kids Are Taking Acid The Flatbush Zombies: Meechy Darko (left) and Zombie Juice (right). Photo by Conor Lamb. The Flatbush Zombies' whole crew is sleeping the day away when I enter their crash pad somewhere in Brooklyn. It’s the midafternoon and four dudes are still sprawled out over two oversized mismatched couches under a haze of last night’s stale reefer smoke. From hung-over murmurs, I gather that there are acid tabs in the refrigerator and treasure troves of sour diesel weed hidden like stinky Easter eggs all over the apartment. Zombie Juice and Meechy Darko, the MC duo that make up the Flatbush Zombies, are in the flophouse’s only bedroom. Historically Hardcore - Fake Smithsonian Ads Jenny Burrows and Matt Kappler teamed up to create “Historically Hardcore,” a lovingly crafted series of ads for the Smithsonian that one-up the exploits of modern-day rockers and rappers with tales of historic figures, well, being hardcore. The ads are not official Smithsonian copy, however, but were a portfolio project for both artists. At that, over the past few days they have stirred up a ton of interest in history and in the Smithsonian online, particularly among the younger audience they were trying to reach with their light tone and contemporary references. Mission accomplished, right?

The Manhattan Project's Fatal "Demon Core" Sixty six years ago today, Louis Slotin saw a flash of blue light in the depths of Los Alamos National Laboratory. Seconds before, all that separated the young scientist from a lethal dose of radiation was a thin screwdriver. The screwdriver supported a reflective covering that encased a sphere of plutonium, and if the reflector fell into place, a nuclear chain reaction would commence. When Slotin's hand slipped, a lethal burst of radiation hit him, and he died nine days later. How To Become A Hacker Copyright © 2001 Eric S. Raymond As editor of the Jargon File and author of a few other well-known documents of similar nature, I often get email requests from enthusiastic network newbies asking (in effect) "how can I learn to be a wizardly hacker?". Back in 1996 I noticed that there didn't seem to be any other FAQs or web documents that addressed this vital question, so I started this one. A lot of hackers now consider it definitive, and I suppose that means it is. Still, I don't claim to be the exclusive authority on this topic; if you don't like what you read here, write your own.

Sun's appetite for dark matter may affect Earth's orbit - physic Calculations made by a physicist in Italy suggest that the observable changes to Earth's orbit could be caused by the Sun's appetite for dark matter. This latest research predicts that over the next few billion years the orbits of the planets should shrink considerably, with the Earth to Sun distance halving over this timescale. Physicists believe that some 23% of the mass-energy content of the universe is made up of dark matter, a non-luminous substance that interacts gravitationally with ordinary matter. This dark matter is spread throughout the universe but clumps together at higher densities in the vicinity of visible bodies, thereby forming a "halo" around the Milky Way. Some researchers also believe that the solar system is home to an especially dense lump of dark matter. Accreting since birth

M and Ms Combat Whenever I get a package of plain M&Ms, I make it my duty to continue the strength and robustness of the candy as a species. To this end, I hold M&M duels. Taking two candies between my thumb and forefinger, I apply pressure, squeezing them together until one of them cracks and splinters. That is the "loser," and I eat the inferior one immediately. By Controlling Individual Atoms, Researchers Watch Chemical Reactions at the Quantum Level What's the Latest Development? By isolating two individual atoms at extremely low temperatures, researchers have observed how chemical reactions function at the quantum level for the first time. Researchers at the University of Cambridge's Cavendish Laboratory were able to measure the chemical interactions between individual, ultracold ytterbium ions and rubidium atoms.

Related:  Learning!Advanced Physicsxkcdjoem #6