Short Definition and 523 Threads

Which type of dosimeter is best for pulse short (duration let say 10 ns) dose measurement purpose?

For the first circuit, Req = ZL + ZC = -j/(w*C) + j*w*L = 0 for short circuit, so w = 0? For the open circuit case, -j/(w*C) + j*w*L = infinity, so w = infinity? Is that correct?

Is there some aerodynamic advantage to these short spoilers? Or maybe does it help to keep dirt from accumulating on the rear window? It seems like I'm seeing this feature more and more lately...

Im having a issue with studying physics. When I receive a HW problem I dive deep into the problem in a holistic way. I tend to start solving problems that are related to the HW problem but are not the HW problem itself. For instance, I received a pendulum problem and was asked to find its...

Science project. Real generator. But self made generator multiple magnets. What happens if I spin bar magnets inside a copper wire ring? Instead of rotating 2 separate copper rings inside a magnet that will split different flowing current on to different wires where a brush can join them...

I had a lamp that was good for 10 years but two years ago it was burnt out, I replaced it and in this two years we have a naughty kid playing with it, it is burnt out recently again. Is it likely due to his behavior (switch it ON and OFF within short time) or quality of light bulb in recent...

Hi, I'm wondering why shorted circuit geometry like figure 2 did not sense photocurrent? Even if the the circuit composed like 2, I guess that by the Kirchhoff's Law, voltage should apply to the ampere meter and photocurrent should be sensed. But in real experiment, I found that shorted circuit...

Let ##X## be a bounded subset of ##\mathbb{R}## with infinite cardinality. We consider a countably-infinite subset of ##X##. We write this set as a sequence to be denoted ##\{a_n\}_{n\in\mathbb{N}}##. Now define ##A## to be the set of points in the sequence with the property that for each...

Not the numerical age directly, but the length of the telomeres seems to decide, if one gets severe COVID-19. Source: https://www.thelancet.com/journals/ebiom/article/PIIS2352-3964(21)00306-6/fulltext see also: Source: https://pubmed.ncbi.nlm.nih.gov/15771613/

I've been noodling around with derivations of the relativistic energy and momentum, and I almost got it down to just a few lines. But not quite. I'm going to work in one spatial dimension, for simplicity (even though some derivations require a second spatial dimension) Let's assume that there...

I have an assignment for a class where I have to interview Mechanical Engineers. The questions are “Why did you choose this career?”, “Are you happy in this career?”, and “What advice would you give to someone who wanted to pursue this career?” I would appreciate it if someone could answer these...

Hi! I am an engineering student. I have just started reading this book ENGINEERING MECHANICS by PEARSON and got a little confused between short links and weightless links. Please see the examples below and help me explain: 1) Are short links and weightless links the same but with different...

An AWG 4 wire has rating of 85A for 75C temp. If there was only 1 foot of AWG 4 connecting the bus bar and the electric meter. How much current can the 1 foot take? How is the 85A for 75C temp measured or computed?

My reasoning is as follows: with the short circuit present, a 0 resistance can be considered between the terminals. Then, since the only objective of the short circuit current ##I_{SC}## is to give information about the Thevenin equivalent resistance and the open circuit voltage (the existence...

Are our common home appliances mostly designed to protect itself against tough and unusual conditions like sudden power outage or very short power outage? (i.e. power goes off and resumes within short time)? I have an AC unit that it is labelled to suggest not to restart the machine after...

If I have two parallel bars serving as a DC bus with a capacitor across the output and there is a short fault event, I know the peak current is limited by V/X. The instantaneous current would be a function of the time RLC time constant. How do I relate this to the force on the conductors due to...

Hello, A femtosecond optical pulse is characterized by a maximum peak intensity ##I(W/m^2)##, a pulse duration ##\Delta {t}## and a repetition rate ##R (Hz)##. The damage threshold of an optical material is often expressed using either the maximum fluence ##(J/cm^2)## or the maximum intensity...

Here's my attempt: The results I got are close to the required answer, but there is a question telling: I tried to solve it, but Isc and Vt (in open circuit) are decreasing with the increase of the field current , so I didn't get the right answer. Could someone let me know where is my...

V=ir considering the whole circuit Now we knowV=E-ir Then ir=E-ir Therefore i=E/2r Therefore,V=E/2

Hi all! while simplifying this diagram, I thought that R2 and R4 are in parallel while so I simplified the diagram to this BUT THE SOLUTION CONSIDER THAT R4 AND R2 HAVE BEEN COUR CIRCUITED! Any help would be highly appreciated particularly a rule of thumb that helps me to identify a short...

Hello to all, In a short pulse laser emission setup, can a pulse be emmited with beam length shorter than one wavelenght? (can a pulse have a duration shorter than its period?) Lets say a laser emmiter shoots a quarter cycle pulse, what would happen to this short beam? (lets supose the...

Hey fellas! I'm wondering if anyone here has experience taking a short (~1-2 month) leave of absence while being funded by the NSF GRFP. The longer version is that I'm eligible for a medical deferral, as I'm taking care of my mom while she is in home hospice, 800 miles away from my...

Summary: A short introduction to a antique calculator that I recently got I first know about this thing when I was chatting with @jedishrfu a couple months ago, and I was fascinated by it. It functions like a soroban but looks way cooler and easier to carry around. Also, it is a important...

is there some physical limit on the wavelength of electromagnetic radiation? Can there be radiation shorter than gamma rays?

Back in December, I made a thread with a related topic as this titled "Ohm reading when there is a short in the condenser motor". But the question of this thread is distinct from the topic of my "Ohm reading when there is a short in the condenser motor" thread. Therefore, I have decided it...

While trying to dislodge some stubborn coffee debris in the holes of a wet espresso bottomless portafilter by blowing into it I discovered that it produced a tone at just over 3000Hz, with harmonics. I wondered, is there some way to use that to determine something about the hole size and...

I am seeking direction, information, resources and thoughts on the following subject. The common interpretation of the National Electrical Code does not allow you to use multiple smaller equipment grounding conductors in place of one larger one (except in a few cases such as a cable assembly...

Because of the statistical nature of autocorrelation, we know that time events that are closer together are more correlated to each other than to time events that are further apart. Which makes sense because differing perturbations of complex chaotic systems can, and do, have wildly differing...

Some of you may be familiar with the 60 Symbols YouTube channel, that have many great physics videos They also have a sister channel that is dedicated to discussing space related subjects, called Deep Sky Videos. Here I present their collection of videos on the Messier catalog Enjoy this...

Why do short wavelengths carry a huge amount of data not long? I think this is because short wavelengths are faster o_O

Homework Statement The above circuit shows two cells of emfs E1 and E2 and two resistors with resistances R1 and R2. If E2 is short circuited, then what is the current through R1? Homework EquationsThe Attempt at a Solution First of all, i am not sure what it exactly means when a cell is...

Good evening to everyone! I'm pretty new in this kind of job, so every help or advice will be helpfull and I will appreciate it. I know that short circuit current from picture in attachment depends on impedance and reactance of Source MV, transformer example (10kV/0.4kV) and cables. So if I...

Preface to thread: The multimeter is set to read resistance in all the scenarios I ask about in this message. The word "COMP" in the ladder diagram stands for compressor motor. The three letters underneath the capacitor are DRC, which stands for Dual Run Capacitor...

Homework Statement I have a current source of 2mA in parrallel with a resistor of 9.2kOhm and a short. What is the current through the short? Homework Equations The Attempt at a Solution I always thought shorts had an infinite amount of current but maybe I do not quite understand the...

Assume a superconducting parallel circuit being shorted, a 10V ideal battery, and a 5 Ohms resistor connected on one of its path. This means the shorted path has a 0 Ohm resistance, which also means it has no potential difference, how is this even possible if voltage across in a parallel circuit...

I've seen answers saying that electricity takes path of least resistance, I know this and there is no need to explain this for me. A forum's answer told me that the electrons initially flow through to the path with resistance and eventually becomes congested (redirecting the remaining electrons...

Personally, I prefer 5-20 minute movies with both width and depth. Would like to have a natural science focus, especially physics-related. Here are two of my favorites on YouTube. Time-related. One-Minute Time Machine (5:40) A kind of "multi-world generator" with a delete button and quantum...

Homework Statement (Please check the attached image) 2. Homework Equations The Attempt at a Solution Those are my answers. I thought the magnitude of the applied force would be bigger because that would be responsible of keeping the block on that spot without having it pulled back by the...

Hello! I am not going to give details about the situation (for obvious reasons) but here it is: I got accepted for PhD to a very good American university, in experimental particle physics and I met a famous professor here who is willing to be my mentor. I talked to some of his old students and...

I am reading Paul E. Bland's book, "Rings and Their Modules". I am focused on Section 4.2: Noetherian and Artinian Modules and need some help to fully understand the proof of part of Corollary 4.2.6 ... ... Corollary 4.2.6 reads as follows: Bland gives a statement of Corollary 4.2.6 but does...

I am reading Paul E. Bland's book "Rings and Their Modules" ... Currently I am focused on Section 3.2 Exact Sequences in ModR ... ... I need some help in order to fully understand the proof of Proposition 3.2.7 ... Proposition 3.2.7 and its proof read as follows...

I am reading Paul E. Bland's book "Rings and Their Modules" ... Currently I am focused on Section 3.2 Exact Sequences in ##\text{Mod}_R## ... ... I need some help in order to fully understand the proof of Proposition 3.2.7 ... Proposition 3.2.7 and its proof read as follows: In the above...

I am reading Paul E. Bland's book "Rings and Their Modules" ... Currently I am focused on Section 3.2 Exact Sequences in \text{Mod}_R ... ... I need some further help in order to fully understand the proof of Proposition 3.2.6 ... Proposition 3.2.6 and its proof read as follows: In the...

I am reading Paul E. Bland's book "Rings and Their Modules" ... Currently I am focused on Section 3.2 Exact Sequences in \text{Mod}_R ... ... I need some help in order to fully understand the proof of Proposition 3.2.6 ... Proposition 3.2.6 and its proof read as follows: In the above proof...

I am reading Paul E. Bland's book "Rings and Their Modules" ... Currently I am focused on Section 3.2 Exact Sequences in ##\text{Mod}_R##... ... I need some help in order to fully understand the proof of Proposition 3.2.6 ... Proposition 3.2.6 and its proof read as follows: In the above...

Hello Friends! Which company do you recommend for a solid hands on short term training(1-5 weeks) in Europe/Asia for electrical engineers? I wish to get a solid training in one of the following areas: 1- Industrial control system and automation 2- Building installation (data + power) 3-...

Thank you for reading my post. I was watching the video this video on transformers and saw an amazing demo: From 4:00-5:20 the guy does an experiment where he has a simple transformer circuit set up: On the primary side of the transformer he has an AC power supply, and a lightbulb. On the...

Hi, I made the following command in MATLAB to test for the following: \begin{equation} \langle T\psi,\phi\rangle=\langle \psi, T\phi\rangle \end{equation} %Self-adjoint test syms x a = (diff(exp(-x^2)))*exp(-2*x^2) b = (diff(exp(-2*x^2)))*exp(-x^2) W = int(a, x) P = int(b, x) O=W-P and it is...

What are the possible hazards and causes of short circuit internally in a synchronous generator?