Running Definition and 386 Threads

Running is a method of terrestrial locomotion allowing humans and other animals to move rapidly on foot. Running is a type of gait characterized by an aerial phase in which all feet are above the ground (though there are exceptions). This is in contrast to walking, where one foot is always in contact with the ground, the legs are kept mostly straight and the center of gravity vaults over the stance leg or legs in an inverted pendulum fashion. A feature of a running body from the viewpoint of spring-mass mechanics is that changes in kinetic and potential energy within a stride occur simultaneously, with energy storage accomplished by springy tendons and passive muscle elasticity. The term running can refer to any of a variety of speeds ranging from jogging to sprinting.
Running in humans is associated with improved health and life expectancy.It is assumed that the ancestors of humankind developed the ability to run for long distances about 2.6 million years ago, probably in order to hunt animals. Competitive running grew out of religious festivals in various areas. Records of competitive racing date back to the Tailteann Games in Ireland between 632 BCE and 1171 BCE, while the first recorded Olympic Games took place in 776 BCE. Running has been described as the world's most accessible sport.

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  1. Telemachus

    Running a multidimensional problem on a single core

    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...
  2. Stephenk53

    B Running on Ice: My High School Story

    I am currently in high school and about to graduate, any way in the past I often threw caution to the wind and ran on ice when I walked home from school. When I was in middle school it went as poorly as one would expect but for some reason I kept trying, in early high school I became extremely...
  3. ChrisVer

    Question about running "executables" without source code

    I have a simple question I guess, basically by how classes etc are formed. In general a class in C++ has some categories such as private, public and protected, which okay everyone knows/can find what they are meant for. E.g. a private member will not be accessible outside the class member...
  4. O

    Troubleshooting a 2 Pole motor running at low speeds on a VFD

    I run a small food manufacturing operation. We process nuts and seeds. We have several grinders/food processors that run at variable speeds. The speed of the motor is varied using an Emmerson VFD. The turning speed of the grinder is very low ( 50-100 RPM) arrived at using a sprocket and chain...
  5. C

    Conditions of a quarter-circle running through the origin

    Homework Statement and Homework Equations[/B] I was working on a math project involving certain simulations and a quarter circle. The equation of the quarter circle I used is y = r - SQRT(r^2 - x^2). Where r is the radius of a circle and x is greater than 0. The purpose of this is to model is...
  6. Z

    Determining Binary Search Running Time & Understanding

    Homework Statement Hi, I have a problem understanding the following equation related to binary search:Homework Equations int midIndex = (endIndex - startIndex / 2) + startIndex; The Attempt at a Solution If: endIndex = 10 startIndex = 0 then midIndex = (10 - 0/2) + 0; midIndex...
  7. Pushoam

    Power needed to keep conveyor belt running

    Homework Statement Homework EquationsThe Attempt at a Solution Taking change in the kinetic energy per unit time as power, P = ## \frac {d W}{dt} = \frac {d K}{dt} = \frac 1 2 \frac { dm} {dt} v^2 = 36.75 ## watt...(1) ## P = \vec F \cdot \vec v = \frac{ dm} {dt} \vec v \cdot \vec v =...
  8. M

    How can I run OpenFOAM on a Mac using Docker?

    Hi PF I'm learning OpenFOAM and typically would do much more work prior to coming here, but I'm on a time crunch and was wondering if anyone knows how to run an OpenFOAM program? I have a file called "wedge" and within that I have a "constant" file, system file, a "0" file, and two documents...
  9. M

    What is voltage when running current through copper plats?

    Hey everyone, I'm hoping that you guys will be able to help me with some calculations. I was on YouTube and came across this: I then began to wonder if I could make a solenoid using bitter disk as in the video, granted no where near as powerful. I would say 1 tesla using an iron core. After...
  10. ohwilleke

    I Is there a fine structure constant running anomaly?

    Background The chart above, via Lubos Motl's blog which is standard in any textbook talking about supersymmetry, illustrates the running of the the inverse of the Standard Model (SM) and Minimal Supersymmetric Model (MSSM) coupling constants with energy scale for the electromagnetic force...
  11. ORF

    Easy way of counting # processeses running?

    hello I needed to count the number of processes (with the same name). I found that this bash script works, #!/bin/bash exit $(ps cax | grep firefox | wc -l); and the exit value can be caught by this code #include <stdlib.h> // sytem #include <iostream> // std::cout, std::endl int main() {...
  12. J

    How Does a Dog Running on a Ball Affect Its Motion on an Inclined Plane?

    <Moderator's note: Moved from a technical forum and thus no template.> We place a ball on an an inclined plane (angle ##\theta##). At the top of the ball is a small dog who always stays at the top over the course of the ball's movement. What is the motion of the ball? ------------------ I...
  13. M

    Impulse Problem- time-average of normal force when running

    1. The problem statement, all variables, and given/known data A somewhat paraphrased version of the problem: Consider the vertical motion of the center of mass of a 150 lbs person as they run along a track. Suppose the person's cadence is 4 steps per second, and with every stride, they briefly...
  14. H

    Work done running on an inclined treadmill

    Why does it cost roughly the same effort to run against an inclined treadmill as up a hill of the same inclination? That is neglecting the movement of the legs and the bobbing up and down as we run and the wind resistance. I remember being told in school physics that there is no work done unless...
  15. yrjosmiel

    Magnetic field of running current in a wire

    Why are they circular? You know, like this: Why not straight toward the wire?
  16. Y

    Running compatibility to install old program in Win10

    Hi I failed to install an old Avery label maker program in my Win 10 laptop. The same CD was used to install in a few other computers with XP and Win 7. When I tried to install, the computer said the program is not compatible with the computer. I did try right click the installation .exe and...
  17. Altiano

    Should I close the door when running AC in fan mode

    I have a 3x3.5 (meters) room with a bathroom of approximately 1.5 x 2. I want to know whether to close the door or not, If I running Fan Mode. There is wall in front of my door, about 60 cm, My assumption: Fan mode only circulate the air, If I open the door, I'll bring outside air in, which is...
  18. X

    I How To Find 68% Confidence Interval After Running MCMC

    This is not a homework problem so I'm asking it here. I just ran an MCMC and found the best fit parameters for a model of massive gravity. I now need to find the said 68% Confidence Interval interval for those parameters. I have never done anything like this before so I'm clueless where to begin...
  19. N

    How can I achieve higher speeds when running stepper motors?

    Hello all. Thanks for taking up your time to read my post. I have ordered http://uk.stepperonline.com/download/pdf/11HS20-0674S-PG14.pdf stepper motors. I asked the seller how many revolutions the motor can achieve in a minute and they answered 43. I calculated (13 + 212/289) * 200 * 43 / 60 to...
  20. Jack of some trades

    Capacitors on motors: why big C for starting, small for running?

    Long story short, on single-phase capacitor motors, large values of capacitance are used for starting and much smaller values are used for running. Yet it would seem that the amount of electrical phase shift needed is dictated and fixed by the physical relationship between the main and auxiliary...
  21. R

    DC motor running in reverse after repair

    Hi all, so my mercury 25 outboard starter was starting to give it up. I took it apart, and yup, the brushes were badly worn. Well, I have several generic brushes kicking around, so I simply swapped them out. Very simple operation. And yet after assembling the damn thing, it now runs backwards...
  22. andylatham82

    What Is the Correct Calculation for the Running Dog Vector Problem?

    I've been racking my brain for a while now over what I feel should be a simple problem to solve, but my answer is wrong. I'm not wildly wrong, but wrong enough to think I've made a proper error and it's not just a rounding error or something. The question goes like this: A dog in an open field...
  23. S

    How to do a running median in n*log2(n)?

    So I came up with the following solution which is n*log2(n) since the input is n elements and I use a binary insertion and calculating the median is constant time. This is passes all the test cases in the tests that don't time out. I need to figure out how to make it faster so I beat the...
  24. T

    Running code using XCode vs Terminal

    I have a C++ code, test.cpp, and am using OpenMPI when running it. I followed the instructions here and it appears to have called OpenMPI correctly. I can compile and run the code perfectly fine from the command line but I just have to specify "TMPDIR=/tmp" before running it, i.e.: $ mpic++...
  25. ChrisVer

    Python Multiprocessing with subprocessing running

    Hi, I have created the following code: import subprocess import threading import multiprocessing import timedef run_proc( name ,locker): #locker.acquire() cmd = './Executable -a -b -m %s -p Low -bins=100 --max=%s -c %s channel%s'%(name[0],name[1],name[2],name[3])...
  26. J

    I Energy transfer during uphill vs downhill running

    Hello Physics Gurus, Please critique the following logic... When a runner hikes/runs to the top of a mountain, the chemical potential energy inside the muscles transferred into the potential energy of the runner's body mass at the higher elevation (Pe = mass*gravity*height = mgh). Energy is...
  27. T

    How to calculate the running time of a battery?

    Hello I have a circuit. When I power the circuit with a power supply, the power supply reads 5V and 0.025A. This gives me the P=IV=0.125W. Is this the same as 0.125W per second? I want to power this circuit with a Li-Ion battery that is rated 5V and 3200mAh. How long will my battery run...
  28. T

    Design choices for running an Electric train (and network)?

    Hi, I'm going to pose my questions with a number of assumptions, so please pick me up on any that are wrong. I want to know the design choices behind electric trains historically and current, this will mostly require some context of induction motors and inverters. I don't know exactly how EMUs...
  29. S

    A Running coupling of the Higgs potential

    Why is the coupling constant of the Higgs potential not a constant, but is a running constant? In other words, ##\lambda (h) \sim \lambda_{0} - \frac{y_{t}}{16\pi^{2}}\text{ln}\big(\frac{h^{2}}{m^{2}}\big) + \frac{\lambda_{0}^{2}}{16\pi^{2}}\text{ln}\big(\frac{h^{2}}{m^{2}}+\cdots##, where...
  30. C

    Find max distance of football thrown while running.

    Homework Statement A baseball player always throws a fastball at a speed of 40.26 m/s. What is the maximum distance, in meter, this player can throw the ball while running toward his teammate who catches the baseball at the same height as he throws at, assuming that this player runs at a speed...
  31. Mr Davis 97

    Minimum time for rowing across a river and running

    Homework Statement In hot pursuit of a suspect, Agent Logan of the FBI must get directly across a 1200m wide river in minimum time. The river's current is 0.80m/s, she can row a boat at 1.60m/s and she can run 3.00m/s. Describe the path she should take (rowing + running along the shore) for the...
  32. Pao44445

    Finding work of a man running up stairs

    Homework Statement During the Powerhouse lab, Jerome runs up the stairs, elevating his 102 kg body a vertical distance of 2.29 meters in a time of 1.32 seconds at a constant speed. a. Determine the work done by Jerome in climbing the stair case. b. Determine the power generated by Jerome...
  33. Bryan Deily

    Running Two Brushed 12V DC Motors

    I am trying to figure out the best way to hook up two 12v DC peristaltic pumps to run as close to the same speed as possible. The manufacturing tests had the pumps running within 10ml per minute which is acceptable; when I hook the pumps up in series they are not even close. When hooked up in...
  34. Luca_Mantani

    A What is the Interpretation of Running Coupling in MS Scheme?

    Hi everyone. I've got some doubts about the interpretation of the running coupling. I'll expose to you some of the results and comments i read in the lectures notes of my QFT professor. As an example, we are studying ##\phi^4## and the 4-point amplitude accounting for the next to leading order...
  35. T

    Running 12V 30 psi Pump: My Questions Answered

    So I am try to run this 12V 30 pis pump and it says to run it at 2.2 amps @ 30 psi. When I supply the pump with 12V I get a reading of 1.4 Amps so I don't really know what it means by the 2.2 Amps and the @ 30 psi means. Can anyone tell me what this means? Thanks
  36. V

    Rat Running on Ice: Solutions & Tips

    Homework Statement Homework EquationsThe Attempt at a Solution There is no tangential acceleration , only normal acceleration ,given by ν2/R .But I do not understand what is the radius of the curve since rat is moving along straight line before and after the turn (I think that is the case...
  37. A

    Acceleration around a running track

    Homework Statement He is running around a running track training for a 400m race. His velocity is 5.11m/s around the circular end of the track, which has a radius of 31.8m. I'm trying to find his acceleration which I know is 0.821ms-2 but I can't find out how to get it. Homework Equations v=rω...
  38. 1oldman2

    B Kepler Telescope Running in Safe Mode

    Just noticed the Kepler telescope is running in "safe mode" burning precious fuel very quickly. Could be the end of the show for K-2 if they don't come up with a workaround soon. If anyone hears of progress regarding the problem could they please mention it here? Thanks:smile...
  39. DeepPatel

    Calculating Power of a person running up stairs

    Homework Statement What is the power supplied by a 60.0 kg person running up a flight of stairs a vertical distance of 4.0 m in 4.2 s? m = 60kg d = 4m t = 4.2 Homework Equations P = W / t W = Fdcos(Θ) F = ma The Attempt at a Solution Combining the equations above I did (m) (a) (d) / (t) which...
  40. R

    What is the speed of sprinter running away from lens?

    Firsts of this is not my problem I don't even take physics but it is my girlfriends. She doesn't know how to get the answer an neither do I. I took some physics but not enough for this. 1. Homework Statement A sports photographer has a 160-mm-focal-length lens on his camera. The photographer...
  41. ecoo

    Quick question about a man running on a Merry-go-round

    Hey there, If a man is on the edge of a carousel and starts to run perpendicularly to cause a torque on the carousel (no friction on axis of rotation), will the man be running in place? And if he is running in place, how is rotational momentum conserved of the man-carousel system? I think that...
  42. G

    A 55.0 kg pole vaulter running at 9.0 m/s vaults over the bar

    Homework Statement A 55.0 kg pole vaulter running at 9.0 m/s vaults over the bar. Assuming that the vaulter's horizontal component of velocity over the bar is 1.0 m/s and disregarding air resistance, how high was the jump? Homework Equations KE = 0.5*m(vavg)^2 The Attempt at a Solution KE =...
  43. I

    Average Velocity for a Runner Running Half a Lap

    Homework Statement A runner covers one lap of a circular track 40.0 min diameter in 62.6 s . Homework Equations If she covered the first half-lap in 28.7 s , what were her average velocity for that half-lap? The Attempt at a Solution Attempt 1: Initial Distance: 0 m Distance of a half-lap...
  44. N

    Running around a track (km/hr)

    Homework Statement [/B] Chris runs round a track at a speed of 6 km/hour. Dave runs round the same track in a speed of 9 km/hour. When Chris has run 18 laps, how many laps has Dave run? 2. The attempt at a solution Dave runs 1.5 times faster. So Dave will run 18 laps x 1.5 = 27 laps in the...
  45. alliecat

    Options for running code on a smart phone

    Hello everyone! I am an undergrad currently doing research for a nuclear physicist at the University of Notre Dame. My current project is taking a code (written in Fortran-63 in 1967 ?:)) that calculates relativistic kinematics for two-body nuclear reactions and converting into some sort of...
  46. M

    Running percentage increases and amount of doubles

    Hello people. I want to start of with my first question. What got me thinking about this is actually stock price movements. If a stock rises from 10$ to 15$ on a day, it will have increased by 50% obviously. But what wonders me is what if we break the small movements down. Say that first it...
  47. I

    Matlab running out of memory on code

    Homework Statement I am trying to run code for the code below but MATLAB runs out of data. The Attempt at a Solution NumberOfVariables = 9; k=NumberOfVariables^2-NumberOfVariables+1; integers = 0:k-1; numbers = 1:k-1; tic s = combnk(integers,NumberOfVariables); AllAnswers = []; for i =...
  48. D

    Merge sort running time O(nlogn) formula

    Hello! If T denotes running time, then, as I heard at the lecture, T(n/2) + T(n/2) + O(n) = O(nlogn) where T(n/2) running time for sorting the left half T(n/2) running time for sorting the right half O(n) merging sorted Please, help me to see the math - how did the...
  49. J

    Effect of wind speed on running

    Hi guys, I'm an arts undergrad student with very little knowledge of the sort of physics I'm about to ask. I was wondering if there is a calculation to work out the differentiation between running at a particular speed say 10mph against wind coming towards you at 15mph. As well as it being on...
  50. W

    Run SQL File: Free Programs to Execute and Query Output

    Hi all, I have an .sql file; written as a set of commands, as a general text file, with a .sql extension. I need to execute it in order to get some tables as output, and then run some queries on these tables. Are there some free programs to run/execute the file? I got some hits on a search...
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