/sci/ - Science & Math

I can't for the life of me remember his exact words, but in a feynman book i read a few years ago he gave a brilliant intuitive explanation of noether's theorem. In fact i can't remember the name of the book, it may have been something from his lecture transcripts or it may have been "The Character of Physical Law"

Basically, it explained how significant the independence of time from energy is. Then gave a reasoning based on how certain conservations laws are independent of time. He also says how they hold for quantum physics. I suggest you read Feynman's books if you want a broad and intuitive understanding of good questions such as that.

>>5854322
1676 sorry

>>5854320
I say this because in 1976 olaf measured the speed of light pretty close to the value that we have today.

>>5854313
Oh i see what you meant now. Yes, that was probably the case for a while. Even after olaf's 1976 works roughly 50-60 years after Galileo, many scientists dismissed his measurements and theories. Although it wasn't long till it became accepted.

Although guessing at what they were "thinking" is pointless. I would just assume that because they knew that sound traveled at a certain speed and they had already deduced that a sound made at some distance would take a given (non negligible) time to reach them, thus they knew that the sound they were hearing was technically made in the past. They would probably be able to extrapolate that for light at large distances.

>>5854309
Who was the first man to come up with the idea of milking a cow?
Who was the first to have the idea of flying?
Who was the first person to look up in the sky and ask "Are we alone?"
Can't answer your question.

>>5854298
Yes they did, all the way up until 1929 when hubble published his work regarding variable stars in Andromeda.
I'm not sure what you are trying to say with your second sentence.

>>5854278
http://en.wikipedia.org/wiki/Darwin_%28unit%29

I find the less massive ideas to be more pleasing to theorise.
For example finding a very small solar mass star that has turned into a white dwarf and building an array of satellites around it with large solar dishes and have them transmit electricity via microwaves

Galileo had some ideas about the speed of light but was unsuccessful in measuring it. Olaf Roemer measured the speed of light in 1676. I would say that even though Galileo couldn't measure light speed, just the fact that he believed it to be finite meant that he must have been able to logically conclude that something emitting light very far away would take a given amount of time to reach him.

>>5854248
So... medicine isn't science?

>Is free energy legit?
It's not really a well defined term, but if you mean useable energy generated from nothingness, then no. If you mean energy that can be extracted from an (in our human timeframe) infinite source then yes. We have solar power, we have wind power and we have hydroelectric power. All which are unlikely to run out in the next few million years.

>isn't that impossible somewhere along the lines of a perpetual motion machine?
Once again for all intents and purposes we could call the sun a perpetual motion machine, but even the sun runs out. There is no such thing as perpetual motion, you might consider the universe to be a perpetual motion machine but even that could end. Also, good luck harvesting energy from the perpetual motion of the universe.

>Why do they say that this is tech that is suppressed?
Like all conspiracy theorists, they believe the know something that other people don't. They believe that they are special because they have "woken up" to the "truth" and like to remind others that they are significant and unique by telling others to "wake up" and "stop being a sheep".
Yes the government suppresses things, all governments do. However the millions of hard working scientists of the world are not part of a conspiracy to cover up free energy science. They simply spend their efforts on researching actually feasibly power generation from well known sources. As opposed to some conspiracy hack sitting in his room with a tinfoil hat, some capacitors and a coke bottle who thinks he has made some sort of groundbreaking discovery.

I will give some people credit, there are some actual scientists out there who believe in free energy. Some are out to make money. Some may be trying to gain some significance, and some may just be wackjobs. There are some actual scientists out there who believe that there is evidence to prove that the earth is 6000 years old and it's sad that we give them so much attention.

For example... the speed of sound in diamond is 12000m/s

Sound travels faster in stiff objects.

Sqrt(Coefficient of stiffness/Density)

Darwin predicted, based on homologies with African apes, that human ancestors arose in Africa. That prediction has been supported by fossil and genetic evidence (Ingman et al. 2000).

Theory predicted that organisms in heterogeneous and rapidly changing environments should have higher mutation rates. This has been found in the case of bacteria infecting the lungs of chronic cystic fibrosis patients (Oliver et al. 2000).

Predator-prey dynamics are altered in predictable ways by evolution of the prey (Yoshida et al. 2003).

Ernst Mayr predicted in 1954 that speciation should be accompanied with faster genetic evolution. A phylogenetic analysis has supported this prediction (Webster et al. 2003).

Several authors predicted characteristics of the ancestor of craniates. On the basis of a detailed study, they found the fossil Haikouella "fit these predictions closely" (Mallatt and Chen 2003).

Evolution predicts that different sets of character data should still give the same phylogenetic trees. This has been confirmed informally myriad times and quantitatively, with different protein sequences, by Penny et al. (1982).

Insect wings evolved from gills, with an intermediate stage of skimming on the water surface. Since the primitive surface-skimming condition is widespread among stoneflies, J. H. Marden predicted that stoneflies would likely retain other primitive traits, too. This prediction led to the discovery in stoneflies of functional hemocyanin, used for oxygen transport in other arthropods but never before found in insects (Hagner-Holler et al. 2004; Marden 2005).

Light is an amplitude modulation of an electromagnetic field. If you have no field, you have no light.
In classical physics the scientists of the time called the absolute space of the universe "ether"
In the setting of relativity you find the universe is imbedded in the fabric of space-time.
The problem we find when trying to define the fabric of the universe is that we propose it to consist of space (or nothingness) unfortunately we can only observe the properties of space-time by its effects on the observable matter and energy fields of the universe.

Here is a list of some thesis titles in Mathematics recently published from universities near me:
>Set theoretic and topological characterisations of ordered sets
>Absolute instability in curved liquid jets
>Independent sets in some classical groups of dimension three
>Genus zero systems for primitive groups of affine type
>Theory and Examples of Generalised Prime Systems
>Joint state and parameter estimation using data assimilation with application to morphodynamic modelling

Also you didn't specify which field.

>>5853647
I don't like unspecific questions. The question should clearly state that the sides of the square are intersected by the other lines at their midpoints. Otherwise we just have to make that assumption ourselves.

>>5853976
Beat me to it, this stuff is amazing.
The applications are endless.
Nano-tech is really starting to take off.

Download a newer version of the book, then download the solution manual for that. Finding things for obscure old editions of books is annoying.

>>5851819
How do you propose a rocket escape this ground based vacuum chamber?
Nothing you are suggesting makes any sense.
Why don't you draw a little picture in paint.

>>5851775
What >>5851710 said
Is everything you need to know.
Expand it out using those relationships and then simplify.

In fact i can't even begin to explain how stupid this is.
If you can build a vacuum chamber to orbit... why would you use rockets? you would just make it into some sort of elevator anyway

Ok now i know you are trolling. You cannot build a vacuum tube from cement.

You do understand that it would be cheaper to build a space elevator to orbit than to build a vacuum chamber to orbit?