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středa 11. července 2012

Autor xkcd má nový blog - o fyzice

Randall Munroe, autor (dle mého názoru) nejlepšího webového komiksu xkcd, si založil nový blog What If?, kde se zabývá fyzikálními, statistickými apod. problémy ve formě odpovědí na dotazy čtenářů — čím šílenější, tím lepší. Pochopitelně to dělá po svém, vtipně, přesně a s obrázky. Velmi doporučuji!
What would happen if you tried to hit a baseball pitched at 90% the speed of light? 
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. 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 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. (...)

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