I agree with Cioran, this answer is "standard bible".Originally Posted by Cioran
I see you're near Chicago, YesNo, do the physics department at the University of Chicago do evening classes? It has world-leading renown for general relativity, Robert Wald, for instance.
"Special Relativity" by French was one of my better UG textbooks - you might want to take a crack at that. Another good one is the classic "Spacetime Physics" by Edwin F. Taylor and John Archibald Wheeler.
I could take a class, but it is more entertaining just discussing it. Thanks for the references. I'll keep them in mind when I'm at the library.
So, do we disagree on anything at the moment?
Ultimately, the goal is how to explain relativity to a 7 year old.
My blog: https://frankhubeny.blog/
Disagreement is what seems to be driving this whole theory of relativity to something less obvious then I thought.
I don't think I could still manage an explanation to a 7 year old because it is all not that clear.
it may never try
but when it does it sigh
it is just that
good
it fly
The Dog School of Mathematics: Special Relativity
Actually, my link was to Chapter 2. You should start with Chapter One.
Last edited by Cioran; 10-28-2012 at 01:05 PM.
Cioran this is great thank you.
Let see this bit from the link:
''In physics what you measure is what you get'''
Ok we could define physics then define measurement if we wanted to but two words come to mind:
Photographic memory.
Enough said.
Last edited by cacian; 10-28-2012 at 04:26 PM.
it may never try
but when it does it sigh
it is just that
good
it fly
Is this thread theory,? or I am I living in a 10 dimensional multiverse? is Brian Greene from another Planet and have the Chicago Bears any real chance in our newtonian classical universe, any timespace soon?
Hey, a question I can answer.
Yes, because they aren't the Cubs.
You must be the change you wish to see in the world. -- Mahatma Gandhi
LOL well let's put it this way it is all melting pot.
Anything falls under relativity hence the OP.
it may never try
but when it does it sigh
it is just that
good
it fly
Hi YesNo I was just thinking let's talk space for a minute.
What is the temperature in space?
I am trying to understand why when I put a jacket potatoe without pricking it in the oven, I forgot, it exploded.
I guessed it was because the heat causes pressure and pressure causes explosion.
It is not a fire as such but the actual heat.
Now Galileo thought the center of the universe is the sun. It can't be for this very reason.
Am I right?
it may never try
but when it does it sigh
it is just that
good
it fly
I didn't follow the reason why Galileo was wrong, cacian. Is it because heat exists somewhere other than the sun?
My blog: https://frankhubeny.blog/
Hi YesNo sorry If I am not clear here.
What I am trying to say is that the center of the earth is not hot otherwise it would cause pressure.
I was wondering about space atmosphere.
it may never try
but when it does it sigh
it is just that
good
it fly
The earth has volcanoes and so is active unlike the moon which is not anymore. So, the center of the earth is hot and the pressure would be the volcanic action. I guess it is a good thing the earth doesn't explode like a potato.
The idea of space puzzles me. On the one hand there is the coordinate system which is just a model and on the other hand there is the reality of an expanding space in which light is bent around inertial objects. I suspect the theory would say that the universe doesn't have a center. That would just be the origin of a coordinate system used to model the reality.
My blog: https://frankhubeny.blog/
I am not so sure about center but more the peripheries because a center does not help long term in terms of determining positions and spheres.
What helps is understanding peripheries and how the extend and to where.
Space is space and peripheries is what makes space hollow and expandable.
Centers are irrelevant in my views.
it may never try
but when it does it sigh
it is just that
good
it fly
Space is permeated by the Microwave bakcground Radiation, which is at a temperature of about 3K (yawn...)
It is now more fun talking about it, I read too many of pop sci books in my youth... it tends to be yawn, here we go again,... or I get angry when they don't explain things well (too often the usual case...) The reason I recommend hawking to friends is at least he's short* and his books have lots of pretty pictures, so I probably won't get accused of boring my friends...
I would take cacian's approach to explaining it to a seven year old - you'd both have lots of laughs and that's the main thing. Have you read Calvino's "Cosmicomics"?
Have you tried your 7 year old with Hawking? Try "A Briefer History of Time" for bed time reading and see how it goes. Get the hardback, it's really nice and should last till he's 14 and you want to encourage him to do GCSE physics... (note the "briefer" it's been made easier since "brief" - Mblobdinow is a co-author and he used to right Star Trek episodes ... careful your 7 year old doesn't become a little know-all Wesley Crusher... ("Come on dad, it's obvious,the dilithium crystals are overstretched, so it can't go into warp drive...")
*It's the wheelchair
Last edited by mal4mac; 10-30-2012 at 08:34 AM. Reason: sp
No it has to be hot otherwise we would freeze when the Sun was on the other side of the Earth, and Emperor Penguins would rule.
Space must have an atmosphere, because Fred Hoyle said there were viruses in space, and viruses need an atmosphere to get a party going.
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