# The Naked Scientists Forum

### Author Topic: 100 years of relativity  (Read 5967 times)

#### Pablo

• Jr. Member
• Posts: 33
##### 100 years of relativity
« on: 06/07/2005 04:56:48 »
We are celebrating 100 years of the special theory of relativity. If you were asked to explain the theory in a few sentences, what would you say?  Here goes mine: "Relativity is the union of Electromagnetic theory and Newtonian Mechanics. For Newton there is no limit on how fast an object can go and for Maxwell there is a constant speed. How can there be two kinds of Physics? That's why Einstein's 1st postulate is : "The laws of Physics  are the same for all inertial observers". That is, we have to believe in the unity of all Physics, even if it means to abandon the concepts of absolute time and absolute space".

#### gsmollin

• Hero Member
• Posts: 749
##### Re: 100 years of relativity
« Reply #1 on: 06/07/2005 22:00:41 »
1. The laws of physics are the same for all observers in inertial reference frames.
2. The speed of light, c, is a constant, and is measured to be that constant by all observers, regardless of reference frames.
3. No causative effect may propagate faster than c.
4. Momentum is always conserved.

#### Sandwalker

• Full Member
• Posts: 83
##### Re: 100 years of relativity
« Reply #2 on: 09/07/2005 18:57:56 »
E=mc^2

Go figure!

#### neilep

• Withdrawnmist
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##### Re: 100 years of relativity
« Reply #3 on: 09/07/2005 19:09:00 »
If you get on with your relatives, your relatives will get on with you!!...(err...is that the theory you wanted ?)

Men are the same as women.... just inside out !!

#### Pablo

• Jr. Member
• Posts: 33
##### Re: 100 years of relativity
« Reply #4 on: 10/07/2005 04:45:51 »
How about "if an old lady sits in your lap for 1 minute, it feels like 1 hour, but if a lovely young lady sits in your lap for 1 hour, it feels like 1 minute".

Pablo Gonzalez

#### gsmollin

• Hero Member
• Posts: 749
##### Re: 100 years of relativity
« Reply #5 on: 10/07/2005 13:12:01 »
quote:
Originally posted by Sandwalker

E=mc^2

Go figure!

Actually, this is derivable from the 4 axioms of the theory, if you go figure. It is about the last result to fall out of SR, but the first thing people hear.

#### Sandwalker

• Full Member
• Posts: 83
##### Re: 100 years of relativity
« Reply #6 on: 10/07/2005 15:12:52 »
quote:
Actually, this is derivable from the 4 axioms of the theory, if you go figure. It is about the last result to fall out of SR, but the first thing people hear.

Gets em enquiring (hopefully)!
« Last Edit: 10/07/2005 15:16:28 by Sandwalker »

#### Dr. Praetoria

• Guest
##### Re: 100 years of relativity
« Reply #7 on: 20/07/2005 20:23:00 »
There was a young lady named Bright,
Whose speed was far faster than light;
She set out one day
In a relative way,
And returned on the previous night (Davies, 1992, p. 21).

#### stuffpuppet

• First timers
• Posts: 3
##### Re: 100 years of relativity
« Reply #8 on: 21/07/2005 17:57:33 »
Particle beam//The partical is slower than it,s individual units.

#### Pablo

• Jr. Member
• Posts: 33
##### Re: 100 years of relativity
« Reply #9 on: 22/07/2005 01:40:49 »
Now, can you slow down light? and if so, would this be a violation of Einstein's second postulate?

Pablo Gonzalez

#### Dr. Praetoria

• Guest
##### Re: 100 years of relativity
« Reply #10 on: 22/07/2005 21:08:28 »
Having the need for eyeglasses, I hope light velcity can change.
In regards to Special Relativity, would one think that it is just the constant "c" that is important to this theory, not light, itself or whether it's velocity could be slowed down when passing through some material like my lens?

#### The Naked Scientists Forum

##### Re: 100 years of relativity
« Reply #10 on: 22/07/2005 21:08:28 »