Link Definition and 243 Threads

Can you tie this together for me? My understanding: If something does not have mass, it does not interact with time. If something has mass it interacts with spacetime. When mass interacts with spacetime, and creates gravity, it may travel through n+1 dimensions. My questions: A.Time is...

Homework Statement [/B] Find the instantaneous centers of the linkage below. Homework Equations # of ICs = n(n-1) / 2 The Attempt at a Solution [/B] From the equation above, there are 4(4-1)/2 = 6 ICs in this linkage. But one thing I don't understand is how there are 4 links when 2 and 3...

Homework Statement Plot luminosity distance and redshift z Homework Equations $$d_L(z)=(1+z)r(z)$$ where d_L(z) is luminosity distance and r(z) is the comoving distance. and we have $$r(z)= \frac{H_0^{-1}}{\sqrt\Omega_K}*sinn[\sqrt{\Omega_K}\int_0^z\frac{dz'}{\sqrt{\Omega_M(1+z')^3}}]$$ where...

I am by no means an expert in physics being largely self taught (day job is a medical student) but have an avid interest in trying to understand the fundamental nature of our universe. In doing so I'm currently reading the book "Trespassing on Einstein's Lawn" by Amanda Gefter and came across...

If i understand correctly, the discovery of complex numbers was linked to solving real number problems, s.a. finding square roots of negative numbers. In other words, at first there was a problem that was formulated using real numbers only that had no real number solutions, which lead to...

I solved the equilibrium equations and found that link BD is in tension while link CE is in compression, but my resulting answers for normal stress were wrong. The solutions show that the cross area to be used for normal stress at links BD and CE should be different. Link BD should incorporate...

Anyone have a link to Hawking's master thesis on the big bang?

I have a Asphalt Super that has a 3 link rear suspension with coil overs. I run a flat 1/2 mile track and no matter what I do to it I can't get aggressive on exit. We are very fast and winning races but when I pick up throttle I have to roll it to a mat or it will blow the rear tires off. Entry...

hi, I just looking for Video on diffraction pattern of Electron, and noticed it produces green color pattern. Earlier in chapter, when cathode ray was discovered, it was mentioned that Green glow was Noticed. What is the reason for this green color?

I am having some trouble getting all of my libraries included in my g95 call at the command line (using Windows Powershell). The confusion stems from the purpose and use of the "g95_library_path" variable native to the compiler, and how this enters with the "-L/..." option on the command line...

Dear PF Forum, How can we add link to a particular post in PF thread? I've tried https://www.physicsforums.com/threads/length-contraction.817911/#post-5134477 https://www.physicsforums.com/threads/length-contraction.817911/#post-5137268 But, it always points to different post. Thanks

http://neurosciencenews.com/lymphatic-system-brain-neurobiology-2080/ can this explain why our immune system suffers when we are sad or down?

In quantum mechanics, we can define the scattering amplitude f_k(\theta) for two particles as the coefficients of an outgoing spherical wave. More precisely, the asymptotic behaviour (when r\rightarrow\infty) of a wave function of two scattering particles, interacting with some short range...

The seems to be a link between SR and a magnetic field Feynman mentions it in his "Lectures in Physics". The problem is the explanation is not finished. Feynman's assumes electrons travel at relativistic speeds while they are known to travel at very slow speeds. It seems to me we...

I'm a bit confused wether or not there is a link between harmonic functions (solutions of the Laplace pde) and harmonic oscillating systems? What is the meaning of "harmonic" in these cases? Thanks!

I read an article about creating molecules from photon, and this part- As the photons enter the cloud of cold atoms, Lukin said, its energy excites atoms along its path, causing the photon to slow dramatically. As the photon moves through the cloud, that energy is handed off from atom to atom...

Hi, so I was wondering what specifically the link is between light and time, I know that the faster you get the slower time goes for you, and if you go light speed time does not progress for you, but what is it when light bends around something without interaction? Would it cause no time to pass...

Is it possible to be creative and think differently in just one aspect/area of one's life or must one in general be different/eccentric? I mean, can one compartamentalize one's personality to be very straightforward , say at work, and be very creative otherwise? I lean towards a no; not that it...

Homework Statement 2. Homework Equations 10 Log[10](g/mW)= GdBw The Attempt at a Solution I have attached a document of my approach to this question. I would like to know if my approach is correct? Thank you for your assistance

I have been looking in SUSY and have seen that the CP violation of B mesons into two muons is one of the key facts that has cast further doubt over SUSY. I don t really understand how the CP violation of B mesons is a sign of SUSY issues, so if you are able to clear this up for me that would be...

trying to plot the movement of the instantaneous centre of lock jaw pliers first image is an example of the 4 bar link and the second is a sketch which I've drawn of what i think it would be. is this the only instantaneous centre?

1. It seems that in some Josephson junctions the insulator part is replaced by a gap, as is the so-called mesa. Is it true? 2. What does "weak link" exactly means? Somewhere it is said that the connection part is of a thickness of about 10 angstroms. What is the upper limit of the thickness...

So this is pretty recent but it seems they found that consciousness is somehow linked to QM at least in how the brain works.I hope this doesent mean that thoughts/consciousness have an effect on reality. http://www.sciencedirect.com/science/article/pii/S1571064513001619

I really like the derivations here http://en.wikipedia.org/wiki/Proofs_involving_ordinary_least_squares Could some one recommend a good book for them. I'm tired of googling these equations every time I want to use them. Thanks!

Any help would be greatly appreciated I tried using the search bar but nothing came up.

http://sploid.gizmodo.com/amazing-scientists-make-things-fly-around-in-space-usi-1492880964 I wanted to ask is there a specific reason for the completely horizontal X shape of the levitated particles. If we already have such precise control over the standing waves, couldn't it be possible...

I have a function that results in 'exact' values for even powered summation series but it gives odd results for powers of '2' and '12+', how exciting! Unfortunately this also means the function is a far cry from a 'general solution'... Does anyone have a comprehensive list of power summations...

My book has some questions involving "short links" connecting trusses to a support. It doesn't seem to explain what short links do. Can anyone shed some light? I attached a picture of what they look like. I really just can't find any information on what they do. Is it supposed to be very obvious?

Homework Statement A chain of three links, each with a mass 0.2 kg, is being pulled up by a person lifting the top link with 8.88 N of force and the chain accelerates upward. Calculate three forces that are acting on the middle link while the chain is accelerating. Homework Equations ƩF = ma...

Homework Statement Hello, I know the direct substitution property in calculus. But, the definition of a rational function still confuses me. For example, are these rational functions: y=(x^2+2x+1)/(x+1) y=((x^2+2)^(1/2))/(x+1) The denominator of the first one could cancel. So...

I have a mass (m) at the end of a rigid link of length r, pivoted at the red circle (below). m is acted on by a force (F) which is always normal to the surface shown (thrust from a jet say). My question is will this system reach a steady state, ie will it have constant angular velocity or...

Homework Statement The figure attached contains the link mechanicsm in static equilibrium. The forces F for the link 2 and Q has to be calculated. Given the length of link 2 is 4 cm and a moment of 50 Nm is applied to link 2 Homework Equations The Attempt at a Solution The attempt...

Greetings! This is my first post and I am hopefully doing it in the right section of the site. Onto the topic: I am searching for the mathematical link between the kinetic force applied on two electro-magnets being forced against each other (assume repelling charges) and the effect that it...

Hi ! I've been working about assignments problems and how to solve them. I will have to do a presentation about it in few weeks. However, I'll have to do it in front of 2 judges: one specialized in math and one in physics. Because i don't want the physician to get bored during my...

Hello everyone, For the purpose of my study I would like to know the relation between Pressure and Convection Heat Transfer. Especially the rough pressure when the convection becomes less significant. I did not find satisfying results on the forum. I have to study the global heat transfer...

I'm sorry - I know this is archived somewhere around here but I couldn't find it ... Can anyone give me a link for the set of tests used to identify a crackpot (either the theory or its author). I've forgotten who had it on his website - someone at Princeton, maybe?? I've got a live one on...

Hi, Did anybody see that message "LINK DIED" in Gaussian calculation when there exists iodine atom in organic molecule. I would very appreciate if someone comments on this.

i need some! link or book hi there i need some! link or book or report or any thing about these following: 1 -receiver of AM signal 2 - demodulation of AM signal and thank you

Homework Statement A signal needs to be transmitted over 1.1km, with 12Hkz bandwidth on FM carrier. Carrier freq=875MHz. Allowed up to 1W carrier power transmitted and received thru omnidirectional antennas. antennas low loss, max attenuation = 0.1dB Homework Equations Received...

I would like to collect EMF data into computer, does anyone have any suggestions on where to find any Gaussmeter link with computer for data sharing? Thanks in advance for any suggestions

Homework Statement I have this system (attached) which I need to model using simulink (attached). Homework Equations My available variables/constants are: y, y', tita, tita dot, tita double dot, m=0.1, c=0.1, k=300, l=0.3. I derived the following equations from the free body diagrams; y =...

From this mechanical part (attached), I need to derive a differential equation relating mass 'x' position to hinge 'y' position. \ddot{x}m + b\dot{x} + cx = F The link l would be rotating. I am confused about considering the displacement of x with reference to y. Would this change the...

Hi, I was calculating the Edwards-Anderson Hamiltonian of a Hopf link. A hopf link is like attachment 1. I have drawn the Seifert surface of that link. The surface is shown in attachment 2. It also contains the Boltzmann weight. So, this is an Ising model. I am confused as there are more than...

Hello guys I'm despesrately looking for a link to download a book named as Linear Algebra Problem solvers REA, whatever edition it is. Thank you in advance

Homework Statement I am having difficulties with finding the acceleration at A. In the picture above are the questions that I need help with.

Hi everyone! I would like to analyze a biological signal for periodicities using a Fourier transform, i.e., I'd like to get a frequency distribution plot based on a long stretch of signal. Additionally, I would like to be able to mark the positions of certain frequencies within the signal that...

Hm..., my knowledge is limited within this area. Are these genes certainly linked to intelligence? Not too long ago I was reading some literature explaining that no single gene (at the time) was a gene that determined intelligence, so this leads me to believe this research is more simplified and...

Help me up with a link please ! I want animation of d'arsonval mete movement ..I can't imagine its instruction :(.

If an aluminium disk is placed above a COMPLETELY vertical current carrying iron rod will any flux link with the aluminium disk... Firstly, does it matter if the current is AC or DC. I presumed not as the only difference is that the magnetic field will vary in one case and stay constant in...

the link is worth having a look at to illustrate the scale of our universe http://www.htwins.net/scale2/