Explanation Definition and 961 Threads

Is the presenter's explanation correct in all respects? And has anyone seen one of these "in person"?

Here is the question: Is it true that the value of K depends on the amounts of reactants and/or products that are mixed together initially? Explain. This is my explanation: The reaction always shifts left or right given any initial reactant and product amounts to attain equilibrium. Thus, the...

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We were told that incomplete dominance occurs when in heterozygous condition one of the allele is less efficient and another is normal/wild type/unmodified. Co-dominanace occurs when in heterozygous condition both the alleles produce normal functioning enzyme but both the alleles produces...

I just noticed something that is a little bit of a different perspective on a mass-on-spring (horizontal) simple (so undamped) oscillator's frequency and looking for some intuition on it. There are many ways to derive that for a mass on a horizontal frictionless surface on a spring with spring...

Dear all, Dr. Raymond S. T. Lee in his book on Quantum Finance (page 112), normalizes quantum price return QPR(n) using the following scaling: Normalized QPR(n)=1+0.21*sigma*QPR(n). I don't know of any way of explaining this equation. sigma is the standard deviation of the wave function...

∈Was wondering if anyone here could help me with an explanation as to how Axler arrived at a particular step in a proof. These are the relevant definitions listed in the book: Definition of Matrix of a Linear Map, M(T): Suppose ##T∈L(V,W)## and ##v_1,...,v_n## is a basis of V and ##w_1...

In "Introduction to Quantum Mechanics", Griffiths derives the following formulae for counting the number of configurations for N particles. Distinguishable particles... $$ N!\prod_{n=1}^\infty \frac {d^{N_n}_n} {N_n !} $$ Fermions... $$ \prod_{n=1}^\infty \frac {d_n!} {N_n!(d_n-N_n)!}$$...

We are hearing more of herd immunity particularly in the wake of the recent SARS-CoV2. What is herd immunity? Is it real? Or is it a mere statistical reality? How come somebody who is not vaccinated would be protected because more of somebody else is vaccinated? Logically I am unable to...

Ok, so to be honest I am not really sure to which subcategory this belongs, but I think it is high energy physics. So my question will be rather brief and vague , can you explain me the working principle of a linear transformer driver? Google wasn't of that much help with this one as it seems...

If you derive the equation for orbital velocity you get \begin{equation} v_{orbit} = \sqrt{\frac{GM}{R}} \end{equation} and for escape velocity you get \begin{equation} v_{escape} = \sqrt{\frac{2GM}{R}}=\sqrt{2}\,v_{orbit} \end{equation} I'm wondering if there is a logical/geometrical...

Specifically he homes in on the multiverse and the 10^500 number that crops up. Basically he ends up saying that the whole concept of the multiverse virtually renders any TOE into pointless oblivion. So with this in mind I was wondering if I could also use the multiverse as an explanation for...

Not hw, just reading the textbook. In section 1.5, page 50, the book goes through an explanation that \sin(x+iy) is one-to-one if 0 \le x < \pi/2 and y \ge 0. At one point the book states that for 1 = -e^{-i x_1}\,e^{-i x_2}\,e^{y_1}\,e^{y_2} the absolute value of the left side is 1 and that...

As much as i search Google, in an effort to find out how exactly the constancy of speed of light was historically deduced before 1905, from Maxwell equations or by any other means, i am not able to find such an explanation. In all of the search results that i could find, it is just stated that...

Hello! Is there any simple (i.e. using some physics arguments, without actually doing the math) explanation for why $$\sigma(pp \to \pi^+d)/\sigma(np\to\pi^0d)=2$$ where d is the deuteron? Thank you!

why can't we know where electron goes after it was hit by light? Light has a travel direction, can't we assume that electron bounces to the same direction that the light was headed??

Hi. Over the years I've read LOT of "popular science" (i.e. non-textbook) books on entanglement, and on the explanations / objections / arguments Einsten, Bohr, Bohm and others had that still remain today. There's one aspect which never seems to get covered in these books and I wondered if...

Hi everyone, We've just started special relativity and I'm just wondering if you'd mind clarifying something for me. The transformation is described as x'=x-vt, where x' is moving relative to x. However, in the diagram I've attached, x' is ahead of x ; so why is the transformation described...

I am intrigued by the special-relativity explanation of magnetic force discussed here (linked from the physicsforums FAQ): http://www.edu-observatory.org/physics-faq/Relativity/SR/experiments.html#Length_Contraction Naively, from this explanation, it seems that a test charge at rest in the lab...

Quoting from IceCube Observatory's webpage, (Emphasis added.) The paper, available on arXiv, has been submitted to The Astrophysical Journal. I haven't read through the paper yet, but if this detection cannot be explained by the Standard Model, what could possibly be the cause? Is there any...

My Solution: For the displacement graph, the gradient is crucial to predict the behaviour of the displacement of the block through time. At 1: System is released - velocity is zero, considering forces acting on block, kx < mg, as block is observed to move downwards, and object is...

Tensile tested 2 samples of 1018 unheat treated carbon steel, assumed to be very similar steel (bought from same place, same order, ect) but very different tensile test results. The results of the tensile test can be seen below as well as a few calculated values. I do not know what this would be...

I know how antimatter is created, both naturally and under laboratory conditions. But what boggles me is how we can contain it without it interacting with its surroundings and causing annihilation. Apparently scientists use a "special" magnetic field to contain it. But what's so special about...

Hello, I find something about the Rashba Spin Orbit coupling but I am not sure how to understand it. Hope you can help me. Consider the following picture of the Rashba effect i found: Well i don't really know what's about the arrows here. They should showing the spin direction i guess but i...

Hi, I always used to struggle with the concept of "space itself expanding" (didn't Einstein say that the aether did not exist?) until one day an idea struck me that seemed to explain it all, without any need for complicated math. After talking about it with others, I got some great feedback...

So I'm reading about the Alcubierre warp drive. And it's presented in the ADM formalism. https://en.wikipedia.org/wiki/Alcubierre_drive And I realize that understanding it is being slowed by my not having studied the ADM formalism. So, is there a good text or website or such, that does a good...

Homework Statement: Hello, I have to explain using numbers the Zeeman effect for hydrogen and the setup needed. I have done some research and if I'm not wrong, then a magnetic field of 1 Tesla is needed. I have no idea how to achieve that using commercially available products and how to even...

Summary: Perhaps the Born rule can be understood by considering quantum transitions going both forward and backward in time simultaneously. The probability that an initial quantum state ##|\psi_i\rangle## becomes the final quantum state ##|\psi_f\rangle## is given by \begin{eqnarray*} P(i...

Veritasium posted a video, featuring a visualization of an "intuitive" explanation of the Intermediate Axis Theorem by Terry Tao, based on centrifugal forces in a rotating frame of reference: Unfortunately, the animation is just as incomplete, as Tao's original explanation from 2011, and...

In Shadowitz's book The Electromagetic Field, Section 3-4, p. 129 to 134, there is a very interesting derivation of Ampere's Law. It is a general derivation with a circular source circuit S, and a circular test circuit T. The pages can be seen here, at least from where I post (USA)...

Hi, I understand mathematically why using low resistance results in a greater heating effect. Could someone give an intuitive and microscopic picture of why the current contributes more to a greater power dissipation by the resistor rather than the resistance contribution to the power...

It says that since there is homogeneity in the Universe's temperature, all these points must have come from one source (or a source close to each other?) at a certain time. Then it also calculates the number of these sources and it's ~105. But isn't that very dense mass right before the Big...

Dear all, in the context of my teaching I was wondering what exactly the explanation is of how a mirror works at the atomic level. Apparently, the fact that reflecting materials are often also good conductors and hence big energy bands helps reflecting the photons. Does someone know a nice set...

You can see the effect around minute 1:20 in this video. It seems to me that the un-twist of the elastic band and the rotation of the ball about the line that joins them is what keep the constant the initial zero angular momentum, though I can't tell for sure. The inversion of in the...

Hey Guys/Gals i understand the general premise of this question and can calculate the solution but i am a bit confused. I am supposed to represent a generic state as a linear combination of the |-,x> , |+,x> basis vectors. However i don't know why, is the question actually asking for the...

Is it not fascinating that you can feel eye contact on such distances we do? What is it that we actually detect? I understand that the eye absorb light, it may be the starting point for the explanation?

Hello I could use some help understanding a statement / sentence within my Griffiths Quantum Mechanics book. The same statement is made within video lecture I found surfing to understand the Griffiths text. I have the 2nd edition. (On page 185) Discussing addition of angular momenta – 2 spin ½...

Summary: Kindly explain the source code in R which meant for calculating stationary distribution of a transition matrix. I am trying to understand the following source code meant for finding stationary distribution of a matrix: ### Stationary distribution of discrete-time Markov chain ###...

#================================================================== # Build the transition matrix for random walk on n-cycle #------------------------------------------------------------------ n <- 25 # we are creating (nXn) transition matrix r1 <- c(0, 1/2, rep(0,n-3), 1/2) # create same...

Hiya, I was wondering if one of you clever people here could just affirm something for me. The three body problem : https://en.m.wikipedia.org/wiki/Three-body_problem In classical mechanics. Some background, I wanted to write something in a blog about theory and reality and the differences...

Hi, just browsed through some news stories and saw a story about a group of researchers who seemed to prove we can experience very different realities. I was just wondering if anyone could provide a simple explanation of their experiment and what they did? Do we really live in different realities?

Hi all, the question has been posed many times, unfortunetly, there does not seem to be any explanation for finding the mode of buckling in Question 3B part ii, hence we i am posting. 1. Homework Statement Below in image Homework Equations Also elow in image The Attempt at a Solution The...

Dear community, for my hobby project I found a gearbox online which shall be connected to a electric motor I have. I expect that the driveshafts with CV joints to be connected directly to this gearbox. Can someone explain me the construction as in how should the motor be connected and how the...

In the answer book to Stewart's College Algebra 4th Edition, question 47 in Review for Chapter 2, it takes me, in a distance/rate/time problem, from 4/(r+8) + 2.5/(r) = 1 (which I got), to this common denominator procedure: "Multiplying by 2r(r+8), we get..." WHERE DID THEY GET THE "2"? It...

1. In studies of the heat budget of the global free atmosphere, the concept of “latent heat” (now known as “enthalpy of condensation”) plays an important role[1]. 2. Both observation and experiment confirm that when humid air condenses the temperature of the remaining air increases[2]. 3. This...

Homework Statement Two balls of mass m are attached to ends of two, weigthless metal rods (lengths l1 and l2). They are connected by another metal bar. Determine period of small oscillations of the system Homework Equations Ek=mv2/2 v=dx/dt Conversation of energy 2πsqrt(M/k) The Attempt at a...

Hey, This is more of a discussion rather than a question. A lot of movies (e.g. interstellar, Event Horizon), have a go at trying to explain how the Warp/Alcubierre drive could work, and usually, the argument goes like this: They take a point A and a point B, connect them with a line on the...

I am new to the world of calculus and the first thing that I learned is how to calculate the area under the range of a polynomial function, like: $$\int_1^3 x^2 \,dx$$ when I take the intergal of ##x^2##, I get ##\frac{x^3}{3}##due to the power rule, but it doesn’t make sense to me,why would...

Hello, let us define the Alternator $$Alt(T)$$ where T is a multilinear function $$Alt(T):= \frac{1}{k!} \sum_{\sigma \in S_n} sgn(\sigma) T (v_{\sigma(1)},...,v_{\sigma(k)}))$$. Further recognize that $$S_n$$ is the group of permutations and sgn the signum of the permutation. May...