Link Definition and 243 Threads

I am playing with thought experiments to try to improve my comprehension of relativity. Hopefully I can get some feedback to further enlighten my understanding. I begin with the assumption that orbital trajectories are inertial straight-lines in space-time curved by gravity. Objects in...

in finite element analysis there is no poisson ratio for LINK ELEMENT (truss structure) just explain ?

Hey guys, I was just pondering the idea of dark matter and a thought crossed my mind. I may be entirely off, but a few connections can be made between gravitons and dark matter. Neither can be detected directly with any classical methods (EM, pressure, etc..), and dark matter has no apparent...

There is a great depth to the mathematics associated with music in terms of chord structure and progression, but clearly the brain does not primarily compute frequencies, ratios and sequences when improvising. However, there is clearly a correlation between mathematical abilities and musical...

hi folks, readingthis post: https://www.physicsforums.com/showpost.php?p=992445&postcount=11" I was wondering why this distance of interaction is smaller at higher momentum transfers. Could anyone explaine the link between momentum transfer and distance? derivator

A link to a collection of tutorials and videos on MATLAB. videos: *http://dataminingtools.net/videos.php?id=4 tutorials:*http://www.dataminingtools.net/browsetutorials.php?tag=matlab

I have studied fractals and think of them as things that exhibit self similarity at different characteristic scales. For example a grain of sand looks a bit like a pebble, which looks a bit like an outcrop, which looks a bit like a mountain. If you count the number of grains of sand there will...

Why is it that more physicists aren't looking at possible connections between quantum physics and consciousness like Wolf and Sarfatti ? Seriously... is there no money in it? Not testable? Is it considered career suicide? What is it? Just curious...

Hi. I might just have something here. Please let me know if you have any questions or comments. Thanks. Andy Lee. leeaj@shaw.ca See proof at http://www.facebook.com/pages/Goldbachs-Conjecture-Proof/237054761999

as exciting as it is, it will never get the press tiger woods is getting.. http://www.foxnews.com/scitech/2009/12/18/scientists-announce-possible-discovery-dark-matter/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%253A+foxnews%252Fscitech+%2528FOXNews.com+-+SciTech%2529 sorry...

Not sure if this is much of guidance, but seemed to be the best category? Is there a place where I can check nationwide statistics for Undergraduate Physics enrollment? I know that Physics I and II always have a good enrollment of 15-25 students, but as soon as it crosses that upper level...

My lecturer keeps simplifying trigonometric integrals in one line such as \int^{2\pi}_{0}sin^{4}(t)dt=\frac{3\pi}{4} and writes pascals triangle next to it. Just wondering what's the link between them? I'm sure it's obvious and easy, I'd just like to have an fast way of dealing with these

Help!... tension Homework Statement A train is made up of 3 carriages is pulled along a level track by a force of 16500N. Each of the carriages has a mass of 8000 KG, and each experiences 1500N of resistance forces. The train is accelerating at 0.5 m/s/s. Work out the tension in link B...

Hi, I've been looking at some example solution and still haven't found the physical/mathematical explanation for the given solution. Problem: Due to slow satellite stabilization rotation there are big differences between maximums and minimums of received signals. Calculate the power...

I mean to ask is every Energy storage or production associated with mass change?

The major conclusion: “A link between the Sun, cosmic rays, aerosols, and liquid-water clouds appears to exist on a global scale…” http://docs.google.com/gview?a=v&q=cache:k3yiHsNVc1cJ:www.wzforum.de/forum2/file.php%3F0,file%3D11877 keep in mind that solar modulation of clouds of even 2-3...

Hello every1... I'm a mechanical enggineering student... I've been studying theory of Machines... My academic syllabus includes only "Simple Mechanisms"... Now in Simple Mechanisms...the first thing we get to know is a "Kinematic Link"... Definition of a Kinematic Link:-it is a rigid or...

Hello, I'm currently developing a hypothesis on how our universe could be in fact the end of one black hole; a white hole. I've been having difficulties looking for books or research papers to see if this is in fact just a rip from a larger hypothesis or theory. My teacher had told me to visit...

http://www.tgdaily.com/content/view/42519/181/ What do you think? Is this what we've been looking for?

http://news.nationalgeographic.com/news/2009/05/090519-ida-primate-fossil-link.html Any evolutionary biologists here? What do you think?

Hi everyone, I have an investigation to carry out for my Junior Certificate in Ireland. What I'm not sure about is the link between heat and temperature. I know that heat is energy, and temperature is the measurement of this energy, but I'm not sure what the link between celcius and joules is...

Do you know if someone already found a link between Newton : F = G mm'/r^2 and Coulomb : F = K qq'/r^2 laws ?

Link to NASA TV and launch of the Space Shuttle "Discovery"... For those interested, here's a link to NASA TV and launch of the Space Shuttle Discovery somewhere around 7:43 PM EST... http://www.nasa.gov/multimedia/nasatv/

A study conducted in San Antonio indicates that there could be a linkage. Could the cure for MS be as simple as a round of antibiotics? http://www.ksat.com/health/18915077/detail.html

Here is some background on Leonardo Modesto's new paper: It is in this context that Leonardo Modesto has shown that LQG also has this curious fractal-like microstructure down near Planck scale. That the dimensionality declines from the usual 4D at large scale down to 2D at the microscopic...

I know undergrad QM fairly well. There they use the EM potential to introduce EM fields into the momentum. What should I study to understand the connection between EM fields and actual photon particles?

Hello guys, i got a task to design the ground station antenna. I need atleast to figure out G/T of the station. I looked at different link budget analysis, but could not find out how to calclate G/T of the antenna, or atleast how to assume this value. Usually G/T is given, but i got inverse...

Ideology: Humanity’s Weakest Link To study a domain of knowledge one can take several ‘points of view’. One can concentrate on the narrow perspectives or one can take on the ‘standpoint of the whole’. Every citizen of every society has a point of view about almost everything. Opinions...

Homework Statement A chain consisting of five links, each of mass 0.105 kg, is lifted vertically with a constant acceleration of a = 3.5 m/s2. Find the magnitude of the force that link 3 exerts on link 2. Homework Equations F = ma The Attempt at a Solution I did: F = ma FU -...

so i can write the symbols correctly instead of saying x^2/(4 theta *pi) i can learn how to type them in so you guys can undestand me a lot better

It wouldn't surprise me at all if this were true; http://www.ctv.ca/servlet/ArticleNews/story/CTVNews/20080805/alqaeda_report_080805/20080805

im looking for the matter - energy equivelence video .. it shows 10 pieces in a square and then they get rearanged and u end up with 1 piece of "energy out" and the puzzle seems to have the same "mass" ? i can't find this video can someone help me please?

Hey, Quite an interesting topic and I've been bits and bats on the internet, but what do you think is the main links or what are your views?

Nanoscale circuits based on molecules used in sunscreen lotion have led to the discovery of the "missing link" of electronics engineering – a previously mythical device known as a "memristor". First predicted in 1971, the memristor could help develop denser memory chips or even electronic...

i was told to build a method for which if we find the asked value in one of the links we return the previous link i have built a method that supposedly does it the problem is that i was told that this code is wrong because we need to check the "this" link seperatly from the FOR loop why is that...

Does 'category theory' link different mathematical structures? Can you give a superficial example of how this has been done (eg. Name two mathematical structures and, with waving of hands, explain how they have been linked)? Could you direct me to a link where this has been done elegantly in...

Homework Statement http://books.google.com/books?id=XmsbvP1uUeIC&pg=PP1&dq=zwiebach&ei=E4shR6ePNqCOpgLcjd2GCQ&sig=Eqnkxjj7B9gc4-nig1fgUkk7AqQ#PPA207,M1 As you can see on page 207, Zwiebach obtained 12.6 by simply demanding that it be true. He does this also in chapter 11 with equations such as...

Homework Statement http://books.google.com/books?id=XmsbvP1uUeIC&pg=PP1&dq=a+first+course+in+string+theory&ei=3TQHR4nyAqf8pwK3h-GnDQ&sig=Eqnkxjj7B9gc4-nig1fgUkk7AqQ#PPA172,M1 I am very confused about equation 10.33. This equation is not derived it is just given, correct? What does...

Numerous BBC and Daily Mail articles ( yeah, trustworthy sources 8-| ) keep bringing this up, stating that there might indeed be a link between cellphone/radio waves and disease (usually cancer). My mother has informed me that at the latest Romanian Neurology Convention they stated that too...

I am looking for a site that I can type in LaTeX commands and then link it to a friend by email?? Like I want to show a proof and then link it to a friend. Anyone able to help?

is anyone`s blood group like his fathers? has blood group any affect on someones personality ?

Greetings, In one of these threads, somebody commenting on the original thread provided a link to a Penrose lecture. I now cannot find which thread it was in. I'm also not sure - it was either in Genral Relativity or Cosmology threads. Does this ring a bell with anybody. What I'm...

Professor Simon Baron-Cohen is doing an interesting study of the links between autism and the ability to do math or systemise. http://www.timesonline.co.uk/tol/life_and_style/health/article2060584.ece Autism: the truth

Homework Statement I need to calculate the relative error of the nearest neighbor algorithm. The book says it is the difference between the worst and nearest neighbor solution to the nearest neighbor solution. Does the mean that for example I have CITY A, find the fastest way to back to city...

Can anyone refer me to some webpages that contain the expressions and derivations of Resolving power of microscope,telescope and simple triangular glass prism?I am not having a book and simple google search is not providing results needed. What I want is the RESOLVING POWER FORMULA for a...

I have read that the current expansion of the universe could be due to a bare positive cosmological constant along with a negative cosmological constant due to the false vacuum of the higgs field. Currently this negative CC is not enough to cancel the positive cc but with time this can be...

I think I've done this right, but I'm looking for some reassurance because I often make stupid mistakes when converting from dB to watts and back again. Thank you in advance! I'm about to graduate in 2 weeks, and this forum has been AWESOME throughout my college career. Kudos to everyone who...

Hey everyone, I have a few questions. What is the link between electricity and magnetism? Why would moving electrons(current) create a magnetic field? Why does a moving magnetic field induce a current in a conductor? Thanks for responces.

SR uses spacetime diagrams which is what is used to solve hyperbolic and parabolic PDEs but what is the connection between SR and PDEs? Are there PDEs in SR? I have done a first course in SR using Taylor and Wheeler but don't seem to recall any.

An amusing story I came across :biggrin: