Running Definition and 371 Threads

I have seen running or walking in the rain puzzle many times. I have not seen a quick answer to the question yet. I was provoked, when a newspaper claimed a professor had been studying it a bit and came up an answer. Honestly I doubt anyone has studied. My answer is that one should go as...

With which commands can I build and run the tests files in njoy16 on ubuntu?

Hi PF! I'm wanting to run a function in parallel, which I've denoted integrate below, on line 33. from math import * from random import * import math, scipy.special import statistics import multiprocessing as mp # READ MATHEAMTICA FUNCTIONS with open("funcL.txt") as fileL: fL =...

Let's say you are riding a bike very fast, and then you sharply turn into a slide (where the bike is sliding perfectly sideways). I'm trying to calculate the angle that the bike would be leaning at, but I'm having trouble creating the free body diagram. Right now I have the normal force and...

Hello Forum, I am not completely clear on the idea of saving the state of a Python program. We can write a .py program which has instructions, formulas, variables, user inputs, and uses data from an external file, etc., and run such file. However, running the program is different from saving...

Here are the details. I started with a nut and bolt, and drilled a hole down the center of it. I inverted and glued into place a carbon fiber rod in the hole. I glued a bit on the end of the bolt. I wrapped magnet wire around the bolt on each side of the rod 400 times. I made a commutator using...

So i know the total time is 8.6 s t1 + t2 = 8.6s And from the (v^2 - v0^2 = 2as) i will get that after 15m the velocity which is also the highest velocity v^2 = 30a And then after that the velocity will be constant (s = v*t) 45/t2 Now i am stuck here because i have 3 equations but 4...

I am trying to run a code from my computer but its qualities are kind of low. I am trying to run a heavy program and its taking about 40-50 min to solve it. Is there a some sort of a general program where I can upload some files and run the code online from a distant server ? Is there a such thing ?

I started of by trying to find the work for I got stuck because I did not know how to solve for the Force. I solved for the distance by doing 3=d/5s which gave me 15m. but then I couldn't figure out where to go next in the problem because I don't know how to solve for (f) so an explanation would...

Hi there! I wanted to know if i can leave the Plasm Ball turned on all night in my room without any problem. Thanks in advance!

I am doing a cosmological work and I need to run a code form this github page https://github.com/ja-vazquez/SimpleMC I download the whole repository as .zip file and I inserted into my desktop. Then I opened it through vs code and this is how it looks like The problem is that, when I run...

I am trying to run an Xcode project in c++ on a Mac Os. I started by creating new project, selecting command line tool options so that I may use c++ option and proceeded with completing the product name fields and the directory where to save the project on my Mac. The default project that is...

My current DIY project is the 1945 Harley-Davidson UL. The engine is a "side valve" AKA flathead, similar to the ones in older lawnmowers. Pretty low-tech, with manual advance points ignition. Not shown in the pictures are the engine, which is missing a lot of parts, but does include a bunch of...

I'm trying to run electrum (written in python) from the command line on Ubuntu 20. I have 2 similar computers. The first one has version 4.0.4 and once in the electrum folder, I type electrum (the name of the executable file) and it executes whatever command I ask for. My problem is with my...

Hello Forum, I am not sure this question really belongs here but I was not sure where else to post...it is about science and health after all. I started thinking about this question seeing so many people have sadly become homeless and living in their cars because of the pandemic and job crisis...

I have a Intel(R) Xeon(R) E-2274G CPU @ 4.00GHz 4.01 GHz machine which has a published max speed of 5.0 GHz. However, when I run it under load on all 4 cores, it only gets up to about 4.5 GHz: Could someone explain to me why it's not ramping up to the full 5.0 GHz or what I could do to...

Can the Born rule be understood as time running both forwards and backwards simultaneously? The probability ##P_{i \rightarrow f}## that an initial quantum state ##\psi_i## is measured to be in final quantum state ##\psi_f##, after evolving according to the unitary time-evolution operator...

Hello, I noticed that there are some programs that use the browser to run. For example, when launched, the program runs inside the browser as it it was our computer was a local server. I am familiar with the client/server model where a computer (client) communicates with a remote machine...

Hey there, I am a little confused about the way most textbooks and notes I've read find the beta function for QED. They find it by looking at how the photon propagator varies with momentum ##q##, in particular in the context of a ##2\rightarrow2## scattering process which is proportional to...

I am still rather new to renormalising QFT, still using the cut-off scheme with counterterms, and have only looked at the ##\varphi^4## model to one loop order (in 4D). In that case, I can renormalise with a counterterm to the one-loop four-point 1PI diagram at a certain energy scale. I can...

Hi PF! I am trying to computer a matrix of integrals. Think of it something like this: Table[Integrate[x^(i*j), {x, 0, 1}], {i, 0, 5}, {j, 0, 5}] I have 16 cores, and would like to have each core handle a specified amount of integrals. Anyone know how to do this? Thanks so much!

Hi PF! I'm running a CFD (computational fluid dynamics) program OpenFOAM. Liquid is sucked from a tank, where the velocity at the tank outlet (suction point) is controlled by a python script. The boundary condition for velocity at the outlet is below, line 4 being the velocity prescribed at...

Hi, I am trying to understand the running time of FF both the original and improved version. For the original version book says: What I understand from this that before placing the items, FF traverses all the bins from beginning to end i.e. n bins. Now each bin can have n items, because of...

Hi PF! How can I run two bash scripts run1.sh run2.sh simultaneously (having two separate terminals, one for each run.sh, is fine but I'd like to execute the python script from a single terminal)? Won't the below execute run1.sh and then when it's finished execute run2.sh...

The ISS includes a very fancy running machine which astronauts use to maintain fitness. Several astronauts have run Marathons at the same time as the earthly race (London, Boston etc) and, while there have been many press reports of these runs, none has given any indication as to how hard it is...

Who will win this running race? How many seconds are their scores?

The objective: Determine the daily power draw of a Raspberry Pi (Watts per Day) and determine the average daily power generation of a solar panel. Will energy generated be greater than energy drawn? Lets begin, I have a 9 Watt, 18 Volt solar panel. This solar panel is charging a sealed lead...

Hi, I want to know if the algorithm to find prime number has running time O(sqrt(N)) or O(log^2N). log^2N is better than sqrt(N). Also for large values can it become a pseudo polynomial algorithm? Zulfi.

Hey there! I am still rather new to renormalising QFT, still using the cut-off scheme with counterterms, and have only looked at the φ^4 model to one loop order. In that model, we renormalise with a counterterm to the one-loop four-point 1PI diagram at a certain energy scale. Do I simply, in...

I made this scenario where I am looking for the total current running through a wire (I_0). I am also trying to model the current running through the wire (I_0) considering the harmonics contributed by the four loads. But since Fourier stated that a complex waveform is the discrete sum of some...

Hi PF! I recently installed the computational fluid dynamics software oomph-lib, which is similar to OpenFOAM. After installing, I'm trying to run a tutorial provided with the program, described here. I think all I need to do it run the .cc file here, so I type into the terminal >> gcc...

So I know it's generally not a good idea, but I wondered what actually is the limiting factor. Does the magnetron heat up much more quickly? - and if so what's the physics going on that's causing it to heat up - is it increased current in the resonant cavities ? Also is it bad for the cathode...

I did the first three questions and found that the ignition distance without breaking would be 75 m, it would take 8.3 seconds to stop the car with a maximum acceleration of -3.0 m/s^2 and you would go 103,75 m if so.

My mother has an alternating current extractor fan plugged into the mains. I want to run it at different speeds. I am thinking of using a light dimmer switch to deliver variable voltage to control the fan speed. (An electrical engineer friend told me that it is possible only if the fan is...

Hi everyone, I understand that the phenomenon of running charge predicted by QFT has been experimentally verified: the physical charge on an electron really does vary with the energy at which it is measured. I have two questions: (1) Does anyone know what the canonical experiments confirming...

Hi Guys, Single phase capacitor start induction run motor keeps running even after start capacitor is disconnected by centrifugal switch. But in practice, table fan motor stalls and hums when I disconnect starting capacitor when fan motor reaches full speed. Why one phenomenon works in certain...

Background of problem comes from Drude model of a metal (not necessary to answer my problem but for the curious): Consider a uniform, time-dependent electric field acting on a metal. It can be shown that the conductivity is $$\sigma = \frac{\sigma_0}{1-i\omega t}$$ where $$\sigma_0 =...

Hi. Can anyone help me to figure out how to run multiple studies in COMSOL? I want to first compute the displacement of a membrane using temperature load and then find the capacitance between two electrodes using electrostatics. The idea is that as the membrane moves upwards the capacitance will...

Since for the two events of Samir starting the stopwatch, and the stopwatch reaching 10.0s, Samir and his stopwatch are stationary from his own frame of reference, I said it was the proper time and that delta t0 = 10s. Then the speed of the moving frame of reference was 0.6c. I thought placing...

Hi All, I am having what seems to be power-related problems on my Win10 PC. I have looked into Device Manager, I ran DxDiag, checked into Msinfo32 and diagnostics say everything is fine. Problem is light on f12 key turns off and computer powers off despite receiving power ( you can see the...

Hi, I have a case of elevated AC Magnetic field in the house, strongest nearest the electric meter and along the service drop line connecting the house to the street power lines. Should that service drop line measure no current or fields when I shut off my main circuit breaker? it seems shutting...

Homework Statement : [/B]Write a C program to print hello world 2. The attempt at a solution: I am completely new to programming. I am learning C at present. In my college, we use linux. Since my pc has windows installed so I am using cygwin terminal to use linux commands from windows. I am...

Question Has the LHC released any papers or reports on the observed running of any of the three Standard Model coupling constants with energy scale from either Run-1 or Run-2 data (or both data sets)? Last time I looked I couldn't find any data As of January 2014, I had not locate any papers...

Homework Statement Arthur and Robin both can run at speed v_r and walk at speed v_w, with v_r > v_w. They set off together on a journey of distance D. Robin walks half of the distance and runs the other half. Arthur walks half of the time and runs the other half. How long does it take Robin to...

Homework Statement You may have noticed that water sometimes drips from the exhaust of a car as it is running. Is this evidence that there is at least a small amount of water originally present in the gasoline? Homework Equations not sure if there is one. The Attempt at a Solution...

Hi, I have a 2004 Toyota Matrix with 270 000km. It's working great but today when i started my car the battery was going up to 17.2V (i have a battery voltage reader in the car at all time). It's the first time it went up there, it usually stays in the 13-14V. I know something is wrong and I...

Hi PF! I'm using a mac and am running the CFD program openFOAM. As I'm going through a tutorial on openFOAM, I am instructed to type paraFoam & into the terminal. When I do so, I receive this error: This application failed to start because it could not find or load the Qt platform plugin...

Hi. I have written a Fortran program to solve a pde, which has six dimensions. One of these dimensions is time, 3 are for space, and the other are related to velocities. The program works fine when I run it with ##38^3## points in space (one for each space dimension), and 80 other dimensions...