# Relativity

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• 02-10-2005
Sang-drax
Quote:

Originally Posted by Zach L.
Uhh... Been a bit since I've done relativity, but shouldn't the ball only "deform" in the direction it is traveling. (And no, it won't turn into an ellipse and thin out.)

Yes, that was what I was trying to say in the post above.

The high speed of the ball doesn't change anything in this case.
• 02-10-2005
major_small
Quote:

Originally Posted by Zach L.
Uhh... Been a bit since I've done relativity, but shouldn't the ball only "deform" in the direction it is traveling. (And no, it won't turn into an ellipse and thin out.)

So, if it's going straight for the hole ("straight" meaning directly at some projection of it -- i.e. at an angle would work so long as the trajectory takes it through the hole), then it should make it through so long as it would under non-relativistic circumstances. If it isn't on a trajectory that goes through the hole, it has bigger problems to worry about.

we just basically said the same thing, except you used more correct wording and I was assuming the trajectory was exactly perpendicular to the plane the hole was in.
• 02-11-2005
Zach L.
Alright... I just misunderstood the wording (major_small, I still can't quite understand yours... oh well).

Cheers
• 02-11-2005
xxxrugby
If the speed is very very fast. And the ball is not very good fill with air. Then it will become like Rugby Ball. And you yan put it in your cheramic pen.
But if is still to big. Or very well filled with air. With the increased speed also force of hitting the hole is increased, and beacuse of that when ball hit the hole. It will go into holle.
• 02-11-2005
Sang-drax
Quote:

Originally Posted by xxxrugby
If the speed is very very fast. And the ball is not very good fill with air. Then it will become like Rugby Ball. And you yan put it in your cheramic pen.
But if is still to big. Or very well filled with air. With the increased speed also force of hitting the hole is increased, and beacuse of that when ball hit the hole. It will go into holle.

Sorry, I don't understand. :(

Quote:

Originally Posted by major_small
either way, if the ball is malleable enough, and the force is constant, [...]

The deformation due to high speed has nothing to do with malleability.

I was only interested what would happen from a relativistic point of view, and I think the problem is solved. The ball will only deform in the direction of travel, and the speed will not affect its possibilities to travel though the hole.
• 02-11-2005
Zach L.
To "clarify" a bit:

The ball will really contract (not elongate) on the direction of travel. And, no force is necessary (and in fact it complicates the picture beyond the realm of special relativity). The "deformation has nothing to do with the mechanical properties of the ball, and from the ball's own perspective (or rather, the observer on the ball), there will be no deformation at all.
• 02-11-2005
Lurker
Quote:

Originally Posted by Sang-drax
Let's say we have a ball and a hole. The ball is slightly larger than the hole, so it won't fit.

Now we throw the ball at an enormous speed direclty towards the hole. What happens?

(i) (From a person standing beside the hole's POV)
The ball is slightly smaller than the hole and will pass through.

(ii) (From a person standing on the ball's POV)
The hole is much smaller than the ball, so it'll crash when it arrives.

What will happen?

Subject A (thrower) throws Subject B (said ball). A decides to go for the fastball he's been practicing for (a few steroids, but he kinda apologized!) and goes for it. Subject B screams in terror, but it is too late. B has been thrown at a blistering speed of 20,000,001 mph! The whizz of his rubbery flesh skidding against the unforgiving air produces an acrid smell - B is on FIRE! Subject C (fireman) gets the extinguisher, but ALAS - B goes by to fast! A is standing, waiting, preparing for the amazing feat of Subject B meeting Subject D (said hole) in a clash of amazing physics! C is thrown back by the air force created by B. D prepares for impact: "MAN DECK! MAN DECK!". Subject E (other side of hole) screams shrilly in terror of the advancing ball. BOOOOOOOM! B hits D DIRECTLY on target. A pumps his fist up in the air in victory. B SHATTERS D and goes straight through Subject E. Because of the 22.324 dimension universe Subjects A, B, C, D, and E live in, B goes all the way around the world enough times to kill everyone. B finally burns up the last of his energy and EXPLODES, CREATING A GIGANTIMUS BLACK HOLE. This black hole eats EVERYTHING in the universe over a period of 12 hours, then collapses and creates a huge explosion. This explosion, after 15 billion years, is called the "Big Bang" by a large tribe on a planet in a Solar System on the edges of its galaxy.

EDIT: PHEWWWWWW.....deeeeeep breath.

• 02-11-2005
gcn_zelda
Pretty much if you threw it at enormous speed it would go through the earth, but while doing so, the friction between the ball and the air would make it catch fire. It'd pop out in China, where they would eat it like chow mein(or however that's spelled).
• 02-13-2005