Rotational Kinematics

Tornado said:
I recall in my undergrad physics classes, it was explained that a common misconception is that the universe is expanding into empty space from a central point...but in fact it is space itself that is expanding, and in all directions. There is no "center of the universe"...every point is moving away from all other points in all directions. Its like a muffin top, studded with raisins...all of them are moving apart as the muffin is baked and the batter rises.
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Ya, I was "taught" the same thing in 1968. Physics and especially theoretical physics have changed since then. For instance, in 1998 I wrote a paper on Black Holes and updated it a few times in the early 2000s. I refuted some of the thinking of that time. Of course, I being a lay person I could not be heard. I no longer show anyone that paper because some of my thoughts were expressed by Stephen Hawking near the end of his life (having nothing to do with me) so if I say it now, it looks like I'm trying to take his thinking as my own. As an example, in 1970 he stated that the event horizon of a Black Hole could not shrink, but later (1974?) conceded that a Black Hole can evaporate via "Hawking Radiation". Assuming "Hawking Radiation" is real, the theory that nothing can escape a Black Hole is wrong and is considered correct by many.

I'm happy to grant you that the space of our universe is expanding. I'm just not willing to say that the singularity that created our universe popped into existence from nothing and existed somewhere that had no size forever and then popped.

It is very convenient, especially mathematically, to consider the universe to be all there is and to not consider what is outside it. Of course, from our standpoint, our universe is more than enough - we will never even explore our galaxy much less the universe.
 
If your in a car traveling at the speed of light and you turn on the headlamps does it matter? Steven Wright
 
MikeG said:
If your in a car traveling at the speed of light and you turn on the headlamps does it matter? Steven Wright
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The car doesn’t know it is travelling at the speed of light so from your perspective it’s headlights work just the same as at any other speed.
 
A point singularity is not a “thing”, it is a “concept”. The same is true for infinity.

Subatomic particles occupy no space therefore if our universe did originate from a single point there is no problem with it containing all the matter in the universe.
 
MikeG said:
If your in a car traveling at the speed of light and you turn on the headlamps does it matter? Steven Wright
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Actually, since the car has mass and less than infinite power, it could never reach the speed of light which, to the car, is infinite velocity.
 
marshg246 said:
One postulate is the multiverse. The trouble is, I can conceive what is non-existent outside the universe - more nothing. Even considering the multiverse or many universe theories, they all leave the fact that most consider negative space must be ignored. That which cannot be explained cannot exist is the basic thinking. But then not log ago, Black Holes were considered to be forever and now are not and were considered to be a singularity but clearly are not and it's not even proven that a singularity exists at their center (much like "does the center of a shaft turn").

Of course, what the hell do I know! Sixty years of thought and study have gotten me nowhere near understanding any of this better than anyone else - probably less than many!
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All of the "multiverses" are in the same "universe", or else the word "universe" is defunct.

...that is, unless there are multiple dictionaries, and the "multiverse" has a proper definition in the "multidictionary".
 
grandpaul said:
All of the "multiverses" are in the same "universe", or else the word "universe" is defunct.

...that is, unless there are multiple dictionaries, and the "multiverse" has a proper definition in the "multidictionary".
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This is an unusually good description of the meanings of the term: https://en.wikipedia.org/wiki/Multiverse

The famous dictionaries do define it like you say but that is not how it is used in cosmology.
 
grandpaul said:
All of the "multiverses" are in the same "universe", or else the word "universe" is defunct.

...that is, unless there are multiple dictionaries, and the "multiverse" has a proper definition in the "multidictionary".
Click to expand...
The meaning of the word “atom” changed when they found smaller components in the thing they thought was the smallest component.

The meaning of “universe” changed too, when they started to theorise that there might be more of them out there, or even in here!

Maybe the meanings shouldn’t have changed. Who knows…?
 
Rotational Kinematics
 
You guys are just overthinking things, I am glad I didn't take much notice of high schooling, I was the one looking out the window watching the world go past just waiting to hit 15 years old so I could get out of there and get a job so I could buy a motorcicle, and enjoy life, the only thing I liked about Physic was our teacher she had big boobs, I didn't learn much in that class as my mind and eyes was else where lol.
All of you thinking of these things should just get on your bike and go for a good ride, take your mind off all this nonsense and stop overthinking things, I left school over 50 years ago and have gotten through life without overthinking things, it was my mate's birthday Sunday and I helped him drink a 30 pack of beers and a 6 pack of Jim Beans, a few puffs as well, man did we solve a lot of world problems that day lol.
My brain wasn't real good Monday and took sometime before it started to work again but fu ck it was a great Sunday with a mate I grew up with, he left High school 5 weeks before me and in 5 weeks time I be a old fart like him and get my old age pension, it's a miracle we both made it this far, but we have, all because we don't overthink thing, 52 years of enjoying motorcycling and 50 years of riding my old Norton, life has been good and I am still riding with mates I grew up with.
 
In science, most things oscillate because of energy - why would our universe be different ? - It probably waxes and wanes through a very small hole in the centre of nothing. However it might be impossible to comprehend nothing. This stuff really worries me -it might be a matter of life or death. In a billion years, we might all be dead. Life does not necessarily go on forever. I am happy to see that we are all thinking, however some things might be beyond imagination.
 
ashman said:
You guys are just overthinking things, I am glad I didn't take much notice of high schooling, I was the one looking out the window watching the world go past just waiting to hit 15 years old so I could get out of there and get a job so I could buy a motorcicle, and enjoy life, the only thing I liked about Physic was our teacher she had big boobs, I didn't learn much in that class as my mind and eyes was else where lol.
All of you thinking of these things should just get on your bike and go for a good ride, take your mind off all this nonsense and stop overthinking things, I left school over 50 years ago and have gotten through life without overthinking things, it was my mate's birthday Sunday and I helped him drink a 30 pack of beers and a 6 pack of Jim Beans, a few puffs as well, man did we solve a lot of world problems that day lol.
My brain wasn't real good Monday and took sometime before it started to work again but fu ck it was a great Sunday with a mate I grew up with, he left High school 5 weeks before me and in 5 weeks time I be a old fart like him and get my old age pension, it's a miracle we both made it this far, but we have, all because we don't overthink thing, 52 years of enjoying motorcycling and 50 years of riding my old Norton, life has been good and I am still riding with mates I grew up with.
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In Physics there is an experiment in which a person stands on a turn table while holding a spinning wheel by its axle in front of them. When they tilt the wheel, the direction in which the turntable turns might be important. When I was in primary school, I was always top of my grade - it taught me to fight. In my Matriculation exams, motorcycles caused me to fail most of my subjects. So I got a job and studied part-time while working, so what I learned actually has meaning. I have passed third year university maths, physics and chemistry. I have two diplomas, one in applied chemistry, the other is post-graduate in occupational hygiene. I have also had management training in the department of defence. There is no excuse for being slack. In life, mindset and genuine interest are extremely important. A thing which really bugs me is the way school-teachers usually teach out of context. A simple lecture about the importance of their subject might be motivating.
 

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