I had bazzar thought on relativity

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In summary: Please provide a mathematical proof. In summary, a train 20 feet long would fit between the two points A and C on an embankment, but if it were traveling at a faster speed than the speed of light, the train would appear to have no length to an observer on the train.
  • #1
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if you have a train in moiton in reference to stionary embankment.and the train is 20 ft long.if you have 5 points along the embankment abcde.between ac=ce,ac and ce is 20 ft.so when you speed the train up to a certain point as the front of the train reaches c the train fits between ac.then as the back end of the train reaches c.the train fits between ce.but if its fast enough.to the stationary observer,the both the trains front and back are at c at the same time,giving the train no length.but on the train if the observer was in the middle.when the front of the train is at c he's at b.when the back of the train is at e,he's at d.so to the observer on the train he 20 ft of length when to the stationary observer the train has no length.
 
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  • #2
but if its fast enough.to the stationary observer,the both the trains front and back are at c at the same time,

How so? You have not proven this claim, it could only be true if the speed of the train were c.

You need to specify where and when observations are made. Relativity makes it necessary to specify the full 4 spacetime coordinates of any event, this means you must establish a fixed reference frame for your measurements.
 
  • #3
Since a train can't travel at C, the hypothetical implications of a train traveling at C are meaningless. Sorry.
 
  • #4
what if you take a ball tied to a string,and spin it around in a circle.how fast does it take to spin it to the point where no matter what,when you pass something in the balls path,its going to hit it.a couple thousand rpm's or so should do it.thus the ball is at all points at any given time.if you'd like to prove that one wrong,I'm listening.
 
  • #5
Consider a WWI fighter such as the Sopwith Camel or Fokker DR1, they had a sycronized machine gun that was timed to fire through the spinning propeller. No matter what the speed of the propeller the bullets would pass through the spinning blades without hitting.

Consider this, then reconsider your statement.
 
  • #6
Also, try hitting an electron in a particle accelerator with a ball, haha.
 
  • #7
so what your saying that if you can have a beam of light timed to pass through the path of the train,or say a spaceship passing by a spacestation to get away from the contradiction.a beam of light stationary from the spacestation perpendicular to the spaceship flying bye,would reflect the beam of light.but how much reflection of the light would determine what length the spaceship was by the duration of reflection.but the gravitational field given off by the ship at close to light,dilating time and shinking the ship,would curve the path of the reflecting light,giving us a different position of where the ship was when you tried to test the length of the ship by the duration of relection,making it hard to know exactly the length because you could'nt determine position.by the reflecting light.
 
  • #8
Originally posted by russ_watters
Since a train can't travel at C, the hypothetical implications of a train traveling at C are meaningless. Sorry.

What if train is a photon (say, visible light photon 20 m long)?
 
  • #9
Light already travels at c.
 
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  • #10
There is no such thing as a 20 foot long photon.
 
  • #11
What do you mean? Take a laser beam (say, from a good long-long cavity He-Ne laser) and cut it by 67 nsec shutter, then you get x = ct = 20 m photons out of the shutter.
 
  • #12
It is a 20m stream of photons, not just one.
 
  • #13
No, you start with longer than 20 m photons already (say, from good laser with big and well silvered cavity). Then you chop 20-m chunks out of them. After shutter all your photons got to have then 20 m length (their wave function is exactly 20 m long).
 

What is relativity?

Relativity is a scientific theory proposed by Albert Einstein in the early 20th century. It states that the laws of physics are the same for all observers in uniform motion and that the speed of light in a vacuum is constant.

What is the difference between general relativity and special relativity?

Special relativity deals with the laws of physics in inertial frames of reference, while general relativity includes accelerated frames of reference and the effects of gravity. In other words, special relativity applies to objects moving at a constant speed, while general relativity applies to objects experiencing acceleration or in the presence of strong gravitational fields.

How does relativity impact our daily lives?

Relativity has numerous practical applications, such as GPS technology, nuclear energy, and the understanding of the structure and behavior of the universe. It also plays a crucial role in modern physics and has paved the way for further advancements in our understanding of the physical world.

Why is relativity considered a groundbreaking theory?

Relativity revolutionized our understanding of space, time, and gravity, challenging the long-held beliefs of Newtonian physics. It also laid the foundation for many modern scientific principles and technologies, making it one of the most influential and groundbreaking theories in physics.

Are there any limitations or controversies surrounding relativity?

While relativity is a well-established and widely accepted theory, there are still ongoing debates and research surrounding certain aspects, such as the compatibility of general relativity with quantum mechanics. There are also some alternative theories that challenge relativity, but they have not been widely accepted by the scientific community.

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