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. P

    Calculating Distance and Time for a Moving Car with Constant Acceleration

    Homework Statement A car starts to run from rest with acceleration 0.5 m/s2. How long does it take to travel distance 60m? [sic] (I have a Russian teacher for AP Physics) Homework Equations V= (Xf-Xi)/(Tf-Ti) ΔX= Vi*T+(1/2)aT2 The Attempt at a Solution I tried to find velocity, but that...
  2. A

    Running Red Lights: How Fast Do You Have to Go?

    Homework Statement A police officer pulls you over for running a red light. You tell the officer, “But the light looked green to me!” How fast would you have to be traveling for this statement to be true? Homework Equations ? The Attempt at a Solution Can anyone point me in the...
  3. A

    Running Coupling: QF Theory, Asymptotic Freedom & RG Law

    First a little intro. The process of renormalization introduces in a QF theory a renormalization scale μ. Physical quantities do not depend on it, as a change of μ comes along with the change of the coupling g(μ) according to the RG law. But why then the physics can change so drastically...
  4. MathematicalPhysicist

    Running Vs Walking wrt calories burn. (mathematical question).

    Suppose we have a person, A, who we know his/her physique and biological properties, assume he runs a distance, x, versus the same person walking a distance Bx, where B is some parameter we're doing our optimization on which is >1. Can you find me the minimum value of B for which the same...
  5. N

    Fortran How to read files while running fortran program?

    Hi, I am trying to run a simulation written mostly in Fortran on Linux. The User's Manual says that "To run a simulation one needs to read several input files." Then, it lists a bunch of files. I was wondering what it means by that and how I "read" the files? Thanks in advance, Naomi
  6. M

    Running switching regulators in parallel

    For a high altitude balloon I need to power a radio that draws 1A but briefly peaks at 1.4A for a fraction of a second. <SEE EDIT> I was thinking of using two of these in parallel: http://australia.rs-online.com/web/p/switching-regulators/6727133/ Or one of the above item and one of these in...
  7. C

    Callan-Symanzik equation and the running coupling.

    In these notes(at page 71) Bilal put some emphasis on that the running coupling on a certain scale ##\mu## is defined in such a way that the logarithms in the expansions of the vertex function small. Or equivalently it is defined such that running coupling on the scale in question is always a...
  8. C

    QED running coupling definition.

    Often when one speaks about the effective QED coupling one defines it as $$e = \frac{Z_2 Z_3^{1/2}}{Z_1} e_0 \ \ \ \ (*)$$ when ##Z_1 = Z_2## by the Ward identity this turns out to be ##Z_3^{1/2}e_0## and some authors just define the coupling to be this right away. So why do some make a...
  9. D

    The Impact of Running on Mass: Albert Einstein's Theory

    Hey folks i got a doubt, one of the theories of Albert einstein say everytime we run for example our mass become a little tiny for example one person have 80 pounds when you start run you have for example 79 pounds of weight because of the speed, and when you stop running your mass go back to 80...
  10. A

    Using relative motion (2D) to get rain speed & direction when running

    Homework Statement A person moving towards east with a speed 'v' observes the rain to be falling vertically downwards. When he doubles his speed, the rain appears to come at 30° angle with the vertical. Find the actual speed and direction of rain with vertical. Homework Equations...
  11. Greg Bernhardt

    Quantum internet running at Los Alamos National Labs

    What do you quantum experts think of this? http://www.technologyreview.com/view/514581/government-lab-reveals-quantum-internet-operated-continuously-for-over-two-years/ Link to the paper http://arxiv.org/abs/1305.0305
  12. V

    Difference between running up and walking up?

    Difference between "running up" and "walking up"? A person runs up several flights of stairs and is exhausted when they get to the top. Later, when they have recovered, the same person walks up the same stairs and does not feel as tired. Why is this? Ignoring air resistance, does it take more...
  13. Z

    Loop Running Time: O(n) Not O(n2)

    Can someone explain why the running time of following piece of pseudo code is O(n) and not O(n2)? for i := 0 to n - 1 while A[A[i]] != A[i] swap(A[i], A[A[i]]) end while end for The for loop executes at most n times and the inner while loop executes at most n-1 times...
  14. dexterdev

    Doubt regarding PLL 565 free running frequency

    Hi PF, I am trying out LM565 PLL IC and designed the basic circuit for checking free running frequency f0 (2.5 KHz). I verified the f0 by not giving any input signal (input pin floating, should I GND it ??) Now the problem is that while sweeping the frequencies up and down the free...
  15. W

    Work/Kinetic energy, running a race with mass and speed

    Homework Statement You run a race with your friend. At first you each have the same kinetic energy, but then you find that she is beating you. When you increase your speed by 21%, you are running at the same speed she is. If your mass is 81 kg, what is her mass? Your mass: 81kg Your speed is...
  16. C

    A mass of 30kg on a smooth horizontal table is tied to a cord running

    Homework Statement A mass of 30kg on a smooth horizontal table is tied to a cord running along the table over a frictionless pulley mounted at the edge of the table. A 10kg mass is attached to the other end of the cord. When the two masses are allowed to move freely the tension in the cord...
  17. M

    Fortran Error 112 /undef when running fortran code

    Hi, I am a new Fortran User. I have a problem when I run my code (not errors during building), in fact the code is stopped in the last line and this message appears "Error 112, Reference to undefined variable, array elements or function result" ... write(number,100)k1 open...
  18. H

    How much energy does it take to retain a running speed?

    My question revolves basically around how much energy would be required for a person to exert to remain at a constant speed. While exact numbers would obviously not be possible without a specific example (and would probably be impossible even with a specific example), I am thinking more...
  19. J

    Fortran Running FORTRAN executable from Linux SHELL

    I have noticed an issue I must resolve before writing a GUI for my FORTRAN program in Linux. If I move into the directory (cmd line) and type ./myprogram it works fine. It reads the input file from that directory and creates an output file. If I run it from the file manager it gives me 2...
  20. R

    Why Does XMGrace Fail to Load Libraries in Cygwin?

    I need it for my physics class, we are running the plotting tool Grace. I had it running on my computer (with some help) So I think I may have downloaded everything I need to run grace, but when I open up the cygwin terminal and type in xmgrace it says /usr/bin/xmgrace.exe: error...
  21. Saladsamurai

    Python Python: Running a program - Should be simple

    Hello :smile: As strange thing is happening. I have created a simple file using emacs (on a Mac) that contains the following: def main(): print "hello!" if __name__ == "__main__": main() And I have saved it in the working directory as hello.py In a terminal...
  22. P

    Man running up a wheeled block.

    Hi, Homework Statement A man, whose mass is m, is running up a block of mass M (as shown in the diagram, please see attachment) with constant acceleration. The block is laid on a smooth ground. The man starts running from rest and the time it takes for him to traverse a distance L (across the...
  23. O

    Comp Sci Java GUI program determining retail price, does not finish running

    Homework Statement Just trying to finish up this assignment, no errors. I run the program, enter a value and a percentage, then click calculate. Program just runs, never displays results. Check my code below, let me know if something is wrong. Driver: package ch7pc1; import javax.swing.*...
  24. K

    Running old carmageddon on windows 7 64-bit?

    I downloaded a free version of the first carmageddon game and apparently it is only compatible with Windows XP service pack 2. I am running windows 7 64-bit. I've read that there is a trick to getting it to work. Could anyone help me out?
  25. P

    A Woman Running Towards a Bus Which Pulls away

    Homework Statement A woman is running at a constant velocity of 5.0m/s in an attempt to catch a bus. When she is 11m from the bus, it pulls away with a constant acceleration of +1.0m/s2. From this point, how much time does it take her to reach the bus if she keeps running with the same...
  26. R

    Fortran Why is Fortran running much slower on Linux?

    I have a Fortran95 program that I run on my Windows laptop (i7 2.0Ghz); its in serial, so its running on one thread, which seems consistent with task manager results (12.5% processor usage), so I figure it should be using ~1 ghz. I am compiling using the standard one that came with my F95...
  27. S

    Forces on Tire & Wheel: Steady Running, Acceleration & Deceleration

    I have 2 doubts . First one was to figure out how the positive and negative scrub radius will affect the dynamic toe during braking or accelerating . Then it made me realize that to understand this I will have to analyse all the forces acting on the tire (tractive forces) . Then i read up...
  28. P

    Time Dilation - Clock running slower?

    Hi, I am having a hard time understanding one thing about this experiment for Time Dilation. I have one observer on a moving train measuring the time it takes for light to travel a distance d and be reflected back and one observer who is stationary, watching the same events. I understand the...
  29. K

    Algorithm running time discrepencies

    Twice I have had to calculate the speed of algorithms depending on input size. The first time I was working in MATLAB(which is based on C) and was timing the difference in time to perform matrix operations on the identity matrix in standard storage and in sparse storage, as I grew the matrix...
  30. P

    Will a Car Speed Up After Releasing the Brakes?

    1. Suppose that you're in a moving car and the motor stops running. You step on the brakes and slow the car to half speed. If you release your foot from the brakes, will the car speed up a bit, or will it continue at half speed and slow due to friction? Defend your answer. Homework...
  31. Y

    Calculating Walking Speed Based on Average Velocity and Distance Traveled

    A man is running and walking a distance of 2 km. He will walk for 1 km and run for 1 km. At the end, his average velocity was recorded to be 15 km/hr. His running velocity is twice that of his walking velocity. What was his walking speed? The answer was recorded to be 7.5 km/hr, but cannot...
  32. A

    Power consumption of a human running

    Homework Statement If a 70kg man is running 3 m/s horizontally, how many watts is he consuming? Homework Equations W = N-m/s N = mass*acceleration The Attempt at a Solution I would assume that in order to get the force in N one would use the gravitational constant of the Earth, but...
  33. A

    MHB Theta(n^2) running time of Quicksort Algorithm

    I am trying to prove the following scenario of Quicksort has a running time of Theta(n^2). Initially, we only have arrays of size n, where n = ij. The idea is that at every partition step of Quicksort, you end up with two sub-arrays where one is of size i and the other is of size i(j-1). i in...
  34. C

    Help simple c program with loop, not running through each integer.

    Homework Statement I want to create a program that prints the sum of integers k for k(1-20) ie, k sum 1 1 2 3 3 6 4 10 5 . 6 . . . . . . 20 . in that format Homework Equations The Attempt at a Solution #include <stdio.h> int...
  35. S

    Cooling air by running it through underground pipes

    An environmentalist friend of mine wants to cool a building on his property (something like a shed or workshop) not with AC, but by blowing air from outside into a pipe underground, running it underground for a distance, and then blowing that air straight up into the building. I need to find...
  36. E

    Calculators Running into a problem with a TI-89 Program.

    Okay so recently I downloaded a Conic section program on my TI-89 Titanium. It has had several issues, which I managed to fix, but I can't fix this one. It can only sometimes find the radius of a circle. From the standard form equation 3x^2-12x+3y^2+6y-15=0 it gets the radius right, which is...
  37. M

    Diode running into the resistor

    http://www.itisff.it/dip_eln/tda2030.pdf Couple questions. 1. In the Typical Application diagram on the left there is Vi w/ a 22k resistor. Appears that there's a diode running into the resistor and then the resistor goes to ground. The question is how should I interpret that? The...
  38. PhizKid

    Does Running in the Rain Keep You Drier?

    http://iopscience.iop.org/0143-0807/8/3/011 I guess it's hard to come by original questions in science these days..
  39. P

    Why is the center of mass energy linked to the parameter \mu?

    My course on QFT follows Srednicki's book. He derives the running of coupling constants in different theories in the following way: When he uses dimesional regularization (going to x-\epsilon dimensions), he has to introduce a parameter \mu with dimensions of mass in oder to keep the coupling...
  40. S

    Mathematica W. Mathematica 8 stays running and does not evaluate

    Hi I am a user of Mathematica as a tool for calculation in Structural Mechanics. I had a problem recently in the integration of expressions a bit long, and honestly I do not understand what might be causing the slowdown. I want to just evaluate this: This is for the Raileygh-Ritz...
  41. Pythagorean

    News Are Financial Adivsers running the US?

    Are Financial "Adivsers" running the US? I recently saw "Inside Job" and realized (or was made to "realize") how the same circle of financial advisers has managed to stay in the white house through several presidencies, left or right. So while we bicker about left vs. right, it seems that many...
  42. T

    One loop Fermi Constant running

    Hi I am attempting to calculate the mass of the W boson according to one loop energies using the equation, Mw2=(πα/GF√2)/sin2θw(1-Δr) where (Δr)top=(3GFMt2)/8√2π2tan2θw using values:- α=α(MZ)=(127.916)-1 GF=1.16634×10-5 sin2θw=0.23116 =>...
  43. J

    Running a vehicle by burning aluminium?

    Apparently aluminium has the highest energy density per unit volume of any material. It can be smelted from ore or recycled oxide using green electricity. People have made batteries using aluminium but they have problems like getting gunked up with Aluminium hydroxide etc. How about burning...
  44. C

    Question about my internet running slow

    My Firefox seems to be running slow, should I delete my cookies or temporary internet files, what do you guys think I should do?
  45. S

    LaTeX LaTex expressions running over following text

    In the past few weeks, I have occasional trouble with my latex expressions (using the itex tag) running over the text that follows them. I also see this in some posts by others. Is there a good way to avoid this? Is it a browser specific problem? ( Mozilla and Firefox are mine.)
  46. J

    Infinite plates, with current running through

    Homework Statement Two infinite sheets of current flow parallel to the y-z plane. The left-hand sheet, which intersects the x-axis at x = 0, consists of an infinite array of wires parallel to the z-axis with a density n = 960 wires/m and a current per wire of IL = 0.15 A in the +z direction...
  47. Z

    What is the running time of this algorithm?

    Homework Statement Suppose that you have k >= 1 sorted arrays, each one containing n >= 1 elements, and you wish to combine them into a single sorted array with kn elements. Homework Equations The Attempt at a Solution Can I assume that each array has a size of n elements for...
  48. H

    How do low mass stars outlive high mass stars?

    I'm just doing some reading on stars and I've hit a problem which I can't solve. According to a book I'm using it claims the amount of hydrogen converted in the Sun over it's lifetime so far is 5.4x10^55. I roughly agree with this figure using the method this author calculates the number. He...
  49. P

    Velocity change by running engine for 1 year

    Homework Statement A rocket engine has an exhaust velocity of 20,000 m/sec. The mass flow (dm/dt) rate is 1 milligram per second. a) What is the thrust produced by the engine? b) The engine propels a 200 kg space craft. What change in velocity is achievable by running the engine...
  50. L

    Running after a bus. acceleration problem

    Homework Statement someone is late for a job interview and is running at a constant velocity toward a stopped bus, at some distance from the bus, the bus begins accelerating as some low constant rate. What's the minimum speed the person must run to just catch up with the bus...
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