Works Definition and 447 Threads

There's a some things I've been wanting to look into for a while now I just don't know where to access that kind of information. 1. I'm interested in any information/journals concerning Physicist Norma G. Sanchez (I might be wrong on her title, please correct me if I am) work on a unifying...

Have you come across this writing by Wolfram on how ChatGPT works? https://writings.stephenwolfram.com/2023/02/what-is-chatgpt-doing-and-why-does-it-work/ Lengthy but interesting. There is also a video by Wolfram on the same topic...

Hello, people say that light has properties of particles and waves. Ok, but how exactly? We have the principle of rectilinear propagation of light as a law on Physics. Light would be a particle that propagates in a direct line pointed to all directions with origin on the source of light. The...

What i mean if we change state/spin at one end it will immediately effect the other. Can we see that live using two camera which may be 10 meter apart so that minium time delay. Is there any video proof exist such kind?

[Mentor Note -- PF thread and MHB threads merged together below due to MHB forum merger with PF] I have to learn in context of lucene, but firstly, I want to learn the example indexing in general. Sth like this-: And I am not getting any google books and pdfs to learn about these topics. I...

How Apple, Google, and Microsoft will kill passwords and phishing in one stroke (Ars Technica) The key acronym is FIDO (Fast IDentity Online). As I understand it, basically, you authenticate yourself to a website or service on your phone using a fingerprint or facial recognition as can already...

"## \left[-\frac{\hbar^{2}}{2 m} \frac{\partial^{2}}{\partial x^{2}}+V(x)\right]\langle x \mid E\rangle=E\langle x \mid E\rangle## is often referred to as the time-independent Schrödinger equation in position space. This equation also results from projecting the energy eigenvalue equation...

Here is the code that I am talking about-: n=int(input("Enter a number")) for num in range(2,n+1): for i in range(2,num): if(num%i==0): break else: print(num,end="") If I give n=5 output should be 2,3,5. Here is my dry run. Everything is fine except for 2...

so my question is a little dumb, if an object on a scale has a weight that points downwards and the scale exert normal force on the object upwards cancelling the forces acted on the object then what does the scale read? also the action-reaction pair to the normal force is supposed to be the...

Hello. I am trying to replicate my first lab class and I was having troule the whole time , the teacher has to attend to other students i ended up not understanding fully what i needed to do. questions I have: what wires connect on the v(multimeter )and (A )multimeter with the resistance .Heres...

Hey guys, I've about a week left to submit my final paper for my trade degree in transportation. The paper is about an analysis of potential implementation of an electric car for direct deliveries in my area where I live. In part of it, I try to analyze how many possible trips a car like...

When we put on perfume for a small amount, the smell could last for a few hours, or at least, an hour, I am wondering why it can last this long? If perfume is in liquid form, we shouldn't be able to detect it because liquid won't go into our nose. If it's in gaseous form, it should be quickly...

Hello everyone, I am determined to clearly understand bitcoin. This is what I know so along with my dilemmas: Bitcoins are a virtual currency with encryption. The exchange of bitcoins is decentralized in the sense that there is/are no institutions like banks that validate the exchange of...

Yesterday the batteries died on my key fob and I didn't have the appropriate batteries to replace them. I thought I could use my power supply to operate the key fob to open the car door but it did not work. I thought that it may be caused by a noisy power supply at the higher frequency range of...

I have a fish tank into which is flowing a steady stream of water at around 2L/H. I set up a submerged pump controlled by a float switch to remove water at the same rate as it was coming in and so maintain a constant water level. The pumped water is discarded to a drain via a 6mm flexible tube...

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https://www.embs.org/ojemb/articles/covid-19-artificial-intelligence-diagnosis-using-only-cough-recordings/ A study has been posted in Engineering in Medicine and Biology (article) that describes the methods and results from an MIT algorithm as applied to asymptomatic COVID-19. Per the...

I have an interesting(IMHO) approach to explaining how the vortex tube works. There are a few explanations on wiki, but not a simple and convincing final one. https://en.wikipedia.org/wiki/Vortex_tube Normally a vortex tube, that runs well, howls very loud. It is a kind of aerodynamically...

I was reading "Significant Figures: The Lives and Work of Great Mathematicians" by Ian Stewart. The following is an excerpt from its chapter on Archimedes: So, the first one was that he proved the surface area of a sphere ##= 4\pi r^2##. The second one is the result that the volume of a sphere...

Hello, The invention of the wheel changed the world. I imagine pulling a cart with square shaped wheels and how difficult and bumpy it would be.The wheel is essentially a circle, a polygon with infinite small sides while the square has only four sides. I guess that, at both end of the spectrum...

A screw fastener advances into a nut. Assuming there are no frictional forces (or negligible): a) Is the action force tangential to the male helical thread (screw) and the reaction tangential (in opposite direction to action) to the female helical thread (nut) b) or does the action-reaction...

If so how does the electric field around look like?

image veichle with 4 wheels ,beams rotate about point " A",each weight can slide radialy on own "beam" ,so weights rotate in cirlce but with different tangential velocity .Different tangential velocity produce greater "centrifugal force" in one part of circle ,so weight "push" at veichle...

Are there video files that I can download to test whether my configuration of VLC (on Linux, Fedora) will be able to play DVDs from various regions? Or must I have physical DVDs to test this?

Hey everyone, I just came across a competition that was run nearly 10 years ago and I was just wondering if anyone here has any interesting ideas on how it could be done. These were the criteria: Store 4kWhr for 18 hours. Temperature for cooking at least 200C. Powered by sunlight. Locally...

Hello guys! I'm just a begginer student. I found this circuit of a wattmeter that works only with resistors. Can someone explain to me how the 33k resistor give a voltage of 1 mV to 1 Watt? I did not understand why these resistor values has been chosen and why the it measures only in the 33k...

This UPS has been lying in the house for around seven years. We detached it from our desktop when it failed to provide backup. Six years back, I opened it up and found a swollen battery. At that point of time, I did not have any testing equipment, nor did I have any knowledge of electronics. So...

I've google all the keywords like "eductor", "ejector", "Venturi pump". All of them are the mechanism or applications that utilize "Venturi Effect". All of them are trying to explain the "suction effect" by saying that restriction area makes the fluid's velocity higher and hence lower pressure...

This question is actually about relativity and quantum field theories. I have the impression that we just use the variational principle, and given the right lagrangian, they lead to equations that we know, are correct. That seems to me a good reason for "believing" that the variationa principle...

Homework Statement:: A particle with mass m is effected by potential V(x) = ∞ when x<0, -V0 when 0<x<a, 0 when x>a A) Set up a relation from which the energy for bounded states can de determined B) For which values V0 does the particle have only one bounded state? Homework Equations...

Hi, does low level hand held laser therapy work for stimulating the hair follicles, scalp and improve your hair’s appearance with a couple of fifteen minute sessions per week? if yes how much do they cost?

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...

Oxytocin is called the love hormone. It regulates and influences one's emotion such that the person (with oxytocin) may fall in love. But there are some unanswered questions. Does the partner with whom one is falling in love, also should have oxytocin secreted? If there are many people in a...

Hi, I can’t understand the concept of Ecube routing. Our src = 001 & dest = 010. XOR of 001 and 010 = 011. So why are we going to 000 instead of 011. Zulfi.

Hi all, Recently, I have been playing around with the Pasco Transformer Demo set of SF-8616. I have been trying to verify the transformer relationship where the "2"s mean secondary and "1's" mean primary. However, no matter what configuration I try, this relationship holds at a single...

https://www.sciencetimes.com/articles/20421/20190418/scientists-discovered-where-anesthesia-works-on-the-brain.htm?fbclid=IwAR3K6nkqpsFpHa27b-fulBZup2xO8FjmuZpHlMQ7lIyDJhgeNoZJvO1gliI In a new study published online in Neuron, scientists believe they have discovered the part of the answer. A...

Here is a Science mag news article on cheaper and more portable MRI for brain scanning. Compared to current machines, it is much smaller (~400 Kg) and cheaper ("if market demand can bring down the cost of a key component, he thinks it could eventually cost $200,000 or less, versus millions of...

I purposely added this post to the general physics thread rather than the biology thread because the solution is probably not in biology. Basically my PhD is in mitochondrial biology. Mitochondria are the energy producing organelles in the body which make energy by adding a chemical bond...

I built a wien bridge oscillator. But how do I tell if it works? I am very new to building circuits. I recently Starting making circuits on a breadboard. I have not taken any Electronics class. I am trying to learn how to do this.

Hi all I am confused with the inductor working, I want to understand it in very much detail. Pl see the following image, First Thing : Here we have an initially uncharged inductor L in fig 1 with a switch S and a const. voltage source of voltage V. Now in fig 2 let the switch is closed at...

Hi guys! I´m doing a project of electronics if anyone can help me to realize it or to see the theory questions i can try to do it. 1. Homework Statement Problem one (figure 1) 1)Two DACs are connected in the manner indicated in figure 1: a)Deduce Vo based on Vb and B (t). b)For what values...

Homework Statement I know that a bead is threaded on an metal sring (no T), and the bead is not moving/ The metal string moves in circular motion at a slope of 60 degrees. The string moves one spin in one second/ which powers works on the bead? Homework EquationsThe Attempt at a Solution

How works a "NOS" of a electric car?

Hello. I've been really curious about how TFP (Thin Flim Polarizer) works. I've searched TFP information through the Internet which tells that TFP utilizes Brewster's angle. This explains how the P-polarization transmits TFP with 100 % transmission, but I don't know how the S-polarization is...

Homework Statement provide a detailed review on how alternating current is produced and the relation that determins movement and current flow direction. Homework EquationsThe Attempt at a Solution I know the basics of how AC is produced- AC is produced from an alternater (type of generator)...

I just like to read and know, and still, I realize that there have been so many works in mathematics and so much to study which I don't even know of. Is there any way I can keep a track of different mathematical works so that I can read them. For example, it was not very late when I came to know...

Hi All, Somehow the copy of AdventureWorks2014 I downloaded ( saved and restored) is missing the data, i.e., it contains the schema : tables, indexes, etc. , but many tables are missing the actual data. I have not done any delete/truncate/drop operations, so this may have been a problem with my...

I read maxwell says electric field polarizes the dielectrics. Does it mean above effect used at photographic camera lens design to make that lens sometimes works like polarizer filter ? Mustafa Umut Sarac Istanbul

does the magnetic field created by AC alternate? reverse poles? if so why does a motor rotate the same way every time? does it alternate in three phase as well? thanks, if you want to direct me to literature i would appreciate that, what i have in my motors book talks about the hand rule for...

Ok so I've been reading a book on electronics and I got to a section that talks about full-wave bridge rectifiers. This is the diagram the author gives: In this diagram he says the D2 and D4 diode are forward biased. But, doesn't the current flow through D2, goes through the resistor, and then...