Edge Definition and 265 Threads

Supposed someone (like a naughty child) sits on the edge of the cantilevered hardened tempered glass table (see photo below) and it breaks. Would all the table glass break into pieces at same time or would the edge break separately? and would there still be sharp edges? I know tempered glass...

I assumed the plate areas to be ##S## , then electric field at ##P## should be $$E_P=E_{+\sigma}-E_{-\sigma}=\frac{k\sigma S}{h^2}-\frac{k\sigma S}{(h+d)^2}\approx \frac{2k\sigma S d}{h^3}$$ but i think it's wrong here as ##P## lies at the edge , so it won't recieve electric fields in a way...

What is the limit of the function as x goes to -5 (e.g. in the graph below) if the domain of the function is only defined on the closed interval [-5,5]? I realize that the right hand limit DOES exist and is equal to 3, but the left hand limit does not exist? So does that mean that the overall...

I have solved many finite element problems using nodal based (rectangular element) for higher order. now i am trying to solve electromagnetic problem using vector element (Nedelec or Whitney). I know only triangular edge based element with first order only and not higher order. i am searching...

Scientists find the source of one of the rarest meteorites to fall on Earth https://www.msn.com/en-us/news/technology/scientists-find-the-source-of-one-of-the-rarest-meteorites-to-fall-on-earth/ar-AA13ejQe Terrestrial modification of the Ivuna meteorite and a reassessment of the chemical...

Is there sufficient mass within the observable universe’s volume to form a black hole event horizon around the observable universe and, if yes would light fired tangentially at the edge of our observable universe ever loop back around in a circle or spiral inwards?

Does nature err slightly beyond order into chaos in the context of chaos theory? And I'd like to proffer the idea that the point at which order tips into chaos actually fluctuates. Nothing in nature is absolutely perfect therefore do natural errors at the point in which order tips into chaos...

Hello there, I am having trouble understanding what parts b-d of the question are asking. By solving the Schrodinger equation I got the following for the Landau Level energies: $$E_{n,k} = \hbar \omega_H(n+\frac 12)+\frac {\hbar^2k^2}{2m}\frac{\omega^2}{\omega_H^2}$$ Where ##\omega_H =...

I am coding Sobel Edges detection in C#. I have a method that converts my image to grayscale. it adds the R G and B values and divides by 3. and replaces the R G and B value out with that same number. That seems to be working fine. Then I added a gaussian blur to it by using this...

Hi PF! Two years ago my lab launched experiments aboard the ISS. The experiment was simple: place two water droplets on a substrate, set camera above the drops, and watch them coalesce. However, the exact size of the drops is unknown (approximately 1 cm radii, though this number is debated)...

One of my players asked about playing a Ninja Juicer (WB7 Japan, p. 84), and I figured it was a reasonable Upgrade Edge. So looking at what changes with the NJ, they get slightly reduced P.S. (so either lower Strength or no Brawny), meditation which let's them seem normal (this is just flavor)...

Moody Blues drummer, co-founder Graeme Edge dies at 80 https://apnews.com/article/entertainment-europe-england-justin-hayward-music-4539837e7e0a8f59c2050c87c260ee42 Nights in White Saturn I'm Just a Singer in a Rock and Roll Band

Hello, I have a few uncertainties about this, Forgive the long questions, I appreciate your time. 1) Why is the maximum energy photon loses during Compton scattering about 0.238MeV (if maximum angle 180 achieved aka backscatter) irrespective of the incoming photon total energy? It seems...

Attempt - I am stuck at this problem for hours, couldn't make any progress. Still, here's what I've done : Let ## e_1 \in E_1 \setminus E_2 ## be arbitrary. Suppose for the sake of contradiction that ## \forall ## ## e_2 \in E_2 \setminus E_1 ##, ## T_1' = \langle V,(E_1\setminus \{ e_1 \})...

Hello there, for part a. of this problem I thought I should try to find the radius of curvature R of the lens using the Lensmaker's Formula. Then it would be quite easy to find the minimum thickness T by just finding the thickness of the circle segment using Pythagoras' Theorem. But part of...

Using Newton's second law, $$ cos\left( \frac{\pi}{6} \right) m(a+g) = 150 \Leftrightarrow a = \frac{\frac{2\times 150 }{\sqrt{3}}-mg}{m} =4.633. $$ Unfortunately, the possible answers are A. 1.025, B. 0.625, C. 3.75, D. 2.75, E. 1.75, F. 0. What am I getting wrong? Isn't the force exerted on...

I very seldom use Edge as a Browser. However when I used it recently I wanted to save the screen image. I could not find anything on the menu to do it. How would I do it?

On the photo you can see: Red 1: the edge is very sharp (as expected) Red 2: the edge is very blurry (but why?) Same for green. You can also see (Red 2) that the blurry edge is yellow. What is this effect called?

I have read some materials about quantum hall effect and know that at the edge of a 2D material , one can linearize the potential V and the linear dispersion relation represents right/left moving fermion. So , Can I say that for a given hamiltonian , if I can linearizae it at edge, then this...

The three lateral edges of a pyramid based on a square are 6016, 2370 and 4350 long. Calculate the length of the fourth lateral edge. We assume that edges 6016 and 2370 extend from the opposite tops of the base.

I can calculate the angular speed but I don't know how to calculate the radius. Is there certain formula to calculate it? Thanks

A is given waveform, we have to use circuits to get B and C waveform. For B we can use an And Gate with 2 inputs, X and Y. X is buffered (to get some delay) and is fed to Y input of And Gate. So we'll get waveform B. But I don't know how to get C waveform. The question is that even if I extend...

My first thread was closed for being too confusing to read. I will try to make it more clear. Also some more parameters: Rod and solid has 0 restitution, solid is anchored and does not move, it is instantly deleted upon collision.

The Hubble telescope was able to capture images of the edges of our visible universe in its deep space photos. These were among its most breathtaking pictures. They show galaxies from about 14 billion light years away, as well as in the past, from the very beginning of time and space in our...

What can we infer about the connectivity and edge connectivity of a graph given the number of edge disjoint paths? So the number of edge disjoint u,v paths in a graph is x. Doing this problem, I thought back to Menger's theorem, and thought that the graph is x-edge-connceted and so the number...

My question might sound stupid to you but please clear my confusions. I'm taking an circular arc like element on the plate. That arc has a radius of 'r' (AB) and the radius is inclined at an angle 'θ' with OA (∠OAB). The area between arc of radius r and r+dr is dA. dA = 2θr.dr The charge on...

First of all, disclaimer: This isn't an official assignment or anything, so I'm not even sure if there is a resonably simple solution. Consider the following sketch. (Forgive me if it isn't completely clear, I didn't want to fiddle around for too long with tikz...) Let us assume that we can...

Can someone please tell is this (https://ibb.co/stGFSKs) figure a polygon. If yes then is the middle line would count as an edge?

Hey, I’m new here .Good to join you all .. I need your help as I don’t know how to study maths . I am always distracted. I even sleep well. I don’t use my social media account or have phone with me still I can’t concentrate. When I start doing maths I feel like I have forgotten everything I...

I opened about 30 Microsoft Edge web pages.. the CPU usage can reach 75%. Why is there so much CPU usage for opened web pages? My processor is Intel Corei5 3.2 Ghz and 16 Gigs of DDR3 RAM.

I want to do a cost estimation for an edge data center in Bakersfield, California. I don't know how big should the center be and i do not know how i can view the data traffic. Can anyone help?

What is the best theory why our vacuum may be in the edge of metastability? Is it possible there are many false vacuum separated by energy barriers and the reason why our vacuum may be metastable is so that it is easier to cross the different false vacua (not necessarily to the true vacuum)?

A stone is thrown vertically upward with a speed of 15.5 m/s from the edge of a cliff 75.0 m high ok, I was going to graph this with Desmos first but don't know how to derive the equation for the parabola. there are 11 questions following this...$$\tiny{Embry-Riddle \, Aeronautical \...

Homework Statement Consider a billiard table with balls of radius r. How high should be the edge of the table to not allow undesirable pressures (and thus slips of the ball)? I.e. if there was no gravity, the billiard ball would still bounce off parallelly to the table plane. However I do not...

Homework Statement "A mortar emplacement is set 27,000 ft horizontally from edge of a cliff that drops 350 ft down from level of mortar...It is desired to shell objects concealed on the ground behind the cliff. What is the smallest horizontal distance d from the cliff face that shells can reach...

Homework Statement The volume of a cube is 'v' cubic yards, and its surface area is 'a' square feet. If 'v' = 'a' what is the length in inches of each edge?Homework Equations volume of a cube = e^3 surface area of cube = 6e^2The Attempt at a Solution volume of a cube = 'v' cubic yards...

In paper PRL 101, 246807 (2008), authors use "Peierls substitution", that is ky -> -i∂ y. As we know, ky is eigenvalue of translation operator in period potential, while -i∂ y is momentum operator, it seems they are huge different. So I wonder how to get ""Peierls substitution" in strict math way?

Hey am new to this forum but I have a question regarding topologically protected states.. Let's suppose we have a 1D gapped system divided two to distinct regions that have different periodicity or different properties and that at the centre, where the two regions 'meet' states appear in the...

Homework Statement A metal disc of radius R rotates with a constant velocity ω about its axis. FInd the potential difference between the centre and the rim of the disc if: a)the external magnetic field is absent b)the external magnetic field of induction B is directed perpendicular to the disc...

Homework Statement [/B] http://imgur.com/a/Ssolz Homework Equations [/B] Elastic Collision so $$ mgh = \frac{1}{2}mv_i^2 = \frac{1}{2}mv_f^2 + \frac{1}{2}I\omega^2 $$ $$ F=ma $$ The Attempt at a Solution [/B] So the problem is similar to this one which allows me to work out the normal force...

I recently read ' Life on the Edge" by Jim Al-Khalili and Johnjoe McFadden. It was very readable and it got me quite convinced about the whole idea. Al-Khalili is a very presentable broadcaster / writer and offers an attractive case. But it was written some while ago and Google hasn't much to...

Homework Statement Hello! I am trying to solve the exercise, but I don't see my mistakes - I can't come up with a correct answer. The exercise from the begging of trigonometry, so it has to be solved using concepts of a speed and angular velocity. A yo-yo which is 2.25 inches in diameter...

So I'm sure you've all heard people talk about increasing expansion of the universe, the compact nature of the universe at the moment of the big bang, and other comments like this. The idea of an expanding universe immediately suggests to me an "edge" of the universe, which is something often...

Hi PF! Attached is an image I generated using the edge function in MATLAB (except the arrows, obviously). I would like to extract just the coordinates of the pixels from the bottom curve, which I've pointed at with arrows, and only in the domain between the red lines. Does anyone know how to...

Hypothetically, what does the edge of the universe look like? Past our known visible universe to the edge of the expanding universe what is it like?

Imagine someone in a planet at the farthest star of the farthest galaxy from ours. From that planet would the sky be a half black and the other half full of galaxies? Could a star be at the "edge" of the universe or general relativity contradicts that?

Homework Statement A ball is thrown at the edge of the roof of a building in a direction at an "alpha" angle above the horizontal. It landed 5 seconds later at 50 meters from the building. The maximum height reached by the ball during its trajectory is 20 meters above the roof. Find The...

Some materials, notably graphene and some other 2D nanomaterials, possesses spin-polarized edge states, e.g., where one edge may allow the conduction of spins oriented "up" while the opposite edge only allows conduction of "down" spins. My question is not why these spin-polarized states exist...

Hello, I have been searching for a mathematical analysis regarding the edge effect of a parallel plate capacitor. Could anyone help?

Hi, I have a thread about 3D graphics in Programming/Computer science subforum: https://www.physicsforums.com/threads/setting-up-3-d-rotation-in-web-page.881634/#post-5550648 where I post a Dropbox link to an HTML5/Javascript file in post #16. When I run Physics Forum with the Edge browser...