What Happens When You Pitch a Baseball at 90% the Speed of Light?

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Discussion Overview

The discussion centers around the hypothetical scenario of pitching a baseball at 90% the speed of light, exploring the implications of relativistic speeds on the baseball's behavior and the resulting energy interactions with air particles. The conversation touches on theoretical physics, relativistic effects, and energy calculations.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • Some participants question whether the explanation provided by xkcd fully covers the scenario or if there are additional possibilities to consider.
  • One participant suggests that a baseball pitched at such high speeds would likely be destroyed due to collisions with air particles, leading to significant energy release.
  • Another participant elaborates on the idea that the collision of the baseball with air molecules would result in disintegration and potentially generate energy beyond manageable limits.
  • A participant notes that at 0.9c, the kinetic energy of the baseball is comparable to its rest mass energy, indicating a substantial amount of energy involved, calculated using E=mc^2.
  • There is a specific mention of the energy output of the explosion being proportional to the mass of the baseball, emphasizing the scale of energy involved.

Areas of Agreement / Disagreement

Participants express varying views on the consequences of pitching a baseball at relativistic speeds, with no consensus reached on the specifics of the energy interactions or the extent of destruction that would occur.

Contextual Notes

The discussion involves assumptions about the conditions of the experiment, such as the absence of a batter and the nature of air interactions, which may not be fully explored or defined.

vhbelvadi
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I came across this from xkcd today. The question seems interesting, but I was wondering if this expplanation quite covers this or are there other possibilities? (Also, is something wrong with this explanation?)

Basically they're dealing with a baseball pitched at relativistic speeds.

http://what-if.xkcd.com/1/
 
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haha, yeah, something like that would probably happen. The ball would definitely get destroyed. Particle accelerators must be vacuum for this reason - if there was air in there, then the particles would collide with them. So if there was a ball going at this speed, then all the particles in the ball would collide with the air particles, giving off ridiculous amounts of energy.
 
@BruceW - An open air particle accelerator--my thoughts exactly!
So, basically, it's 150g of particles colliding with air molecules, so wouldn't the collision (for now let's assume there's no batter for a good distance) cause the entire ball to disintegrate resulting in the generation of energy we can't quite handle?
Or will it be within comparatively safe limits?
 
at 0.9c, the kinetic energy is at a similar level to the rest mass energy. And from what you know about E=mc^2, this is going to be a huge amount of energy since we have a tenth of a kilogram of mass to play with.

Edit: So, specifically, the energy output of the explosion will be of the order of c^2 times by 1/10 kilogram
 
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