Multiple Definition and 1000 Threads

A multiple-unit train or simply multiple unit (MU) is a self-propelled train composed of one or more carriages joined together, which when coupled to another multiple unit can be controlled by a single driver, with multiple-unit train control.
Although multiple units consist of several carriages, single self-propelled carriages - also called railcars, rail motor coaches or railbuses - are in fact multiple-units when two or more of them are working connected through multiple-unit train control (regardless if passengers can walk between the units or not).
The term multiple unit does not denote locomotives using multiple-unit train control.

View More On Wikipedia.org
Recent contents Top users
  1. M

    Fortran Comparing line in one file to multiple lines in another/FORTRAN

    Hi y'all I am trying to compare two files, so make one line from one file be compared to alll the lines in the other file until it finds a match where the difference is less than 0.003. This what I had thought of, but I still think it is just comparing line by line, instead of one line to...
  2. N

    Understanding Standing Waves on a String

    Homework Statement In a standing wave on a string (a)In one time period all the particles are simultaneously at rest. (b)All the particles must be at their positive extremes simultaneously once in time period. (c)All the particles may be at their positive extremes simultaneously once in time...
  3. r-soy

    MHB Probability of Even # or Mult. of 3 from 1-10

    From numbers 1 to 10 find the probability the number chosen is even number or a multiply of 3 Here in this question what mean by (multiply of 3)
  4. C

    Collision of multiple particles

    Hi friends, I have an issue in solving a Collision of multiple particles. Please Help me in solving this. Thank you all in advance. The problem is as: https://fbcdn-sphotos-e-a.akamaihd.net/hphotos-ak-frc3/q71/s720x720/1395304_1432383000322139_406785433_n.jpg Attempt...
  5. D

    Java Java rule on Methods with multiple parameters

    Let's say a method or constructor has multiple parameters example in DecimalFormat -- public final StringBuffer format(double number, StringBuffer toAppendTo, FieldPosition pos) if you don't declare all of the parameters, what happens to those that are not...
  6. O

    Challenge 1: Multiple Zeta Values

    A multiple zeta value is defined as \zeta(s_1,...,s_k) = \sum_{n_1 > n_2 ... > n_k > 0} \frac{1}{n_1^{s_1} n_2^{s_2}...n_k^{s_k}} . For example, \zeta(4) = \sum_{n = 1}^{\infty} \frac{1}{n^4} and \zeta(2,2) = \sum_{m =1}^{\infty} \sum_{n = 1}^{m-1} \frac{1}{ m^2 n^2} . Prove the...
  7. P

    Multiple Linear Regression - Hypothesis Testing

    Homework Statement I'm looking through some example problems that my professor posted and this bit doesn't make sense How do you come up with the values underlined? Homework Equations The Attempt at a Solution Upon researching it, I find that you should use α/2 for both...
  8. E

    Multiple Pulleys and Multiple Weights Problem

    1. Homework Statement Solve for T (The force required to keep the pulleys at equilibrium) See attached image for pulley setup. 2. Homework Equations W2>W1 N=mg 3. The Attempt at a Solution Currently I have drawn out all the forces that act on each pulley, and I know there...
  9. J

    Object with *multiple* velocities nearing the speed of light-effect?

    Object with *multiple* velocities nearing the speed of light--effect? Hello! I've had this question for sometime and I'd love if someone could shed some light on it for me. Here's the situation: Lets say that you were able to make an object reach velocities (and maintain) nearing the...
  10. I

    Electric Potential due to multiple charges

    Homework Statement Homework Equations E = kq1q2/r2 The Attempt at a Solution Please correct me if I am wrong but I think it is A. Since doubling the charge, doubles the potential as well, while doubling the radius between the charges would just exponentially decrease the...
  11. DreamWeaver

    MHB Evaluation of the Multiple Sine Function....

    Part 1:Define the Multiple Sine Function by \mathcal{S}_m(x)=\text{exp}\left(\frac{x^{m-1}}{m-1}\right) \prod_{k=1}^{\infty}\left(\mathcal{P}_m\left(\frac{x}{k}\right)\mathcal{P}_m\left(-\frac{x}{k}\right)^p\right)^q Where p=(-1)^{m-1}\, and q=k^{m-1}\, (these exponents weren't showing up so...
  12. 0

    How To Incorporate Sensor Uncertainties With Multiple Measurements?

    Lets say a sensor measures within accuracy of +/- 0.05N And you take multiple measurements and graph it out. (I.e., 5.12N, 5.15N, 5.05N...). What is the uncertainty of the final average? One way I read is: Sx = s/√N where s = std. dev. N = number of data points But...
  13. O

    How does dy/dt=ry end up with the constant multiple on the right?

    I have, from the textbook: dy/dt = ry So I solve and get y = e^(rt)+C However, the book says that y=y_0 * e^(rt), where y_0 is the answer to the initial condition, y(0). I don't get it. The + C should be what we use to solve for the initial condition; how does y_0 end up in...
  14. M

    The so-called Myth of Multiple Size Infinities

    Someone said multiple infinities are absurd. I can't post the link btw because it's a non-mainstream theory. So there are actually, no multiple infinities? Regarding Cantor's absolute infinity, is this the highest infinity that any man could stated? If there are other infinities higher than...
  15. T

    Help with multiple magnetic field device

    Greetings everyone I am deciding on a project to work on for my bachelor's degree in engineering right now. I have an idea that involves using multiple metal detectors placed about 1-2 cm apart from each other. The idea is to develop a device that is able to detect the shape of an metal item...
  16. D

    Calculating number of steps in multiple loop piece of code

    Homework Statement The following pseudocode demonstrates an algorithm to create a 2D array from a 1D array by adding elements into certain rows: For i = 1, 2, ..., n For j = i + 1, i + 2, ..., n Add up array entries A[i] through A[j] Store the result in B[i, j] Endfor...
  17. Q

    Finding Period Of Voltage With Multiple Frequencies

    How do you solve questions of the type: Find the period of the voltage a) 3cos(2500t) + 4(7500t + pi/2) b) a generic waveform: a*cos(x*t)+b*cos(y*t + theta) I saw questions similar to the above while going through a book. I attempted such questions when I was in college, but don't...
  18. S

    Multiple Blocks on incline, friction vs force.

    Homework Statement Three blocks are on an incline of Theta(a), block 1 has mass of m1, block 2 has mass of m2, and block 3 has mass of m3. Block 2 is being held(theoretically) above the ground by friction between block 1 and block 3. What is the minimum magnitude of force positioned directly...
  19. H

    Deriving with multiple variables

    Homework Statement I'm stuck at one of the derivations for relativistic energy. I've figured out every other single step, but I just can't wrap my head around this one: Prove that: {\frac{d}{dt}} {\frac {mu} {\sqrt{1-u^2/c^2}}} = {\frac {m {\frac{du} {dt}}} {(1-u^2/c^2)^{3/2}}}...
  20. K

    Do professors hate writing multiple LoRs?

    I'm not exactly in college yet but will be soon. Looking at several threads, reus are extremely competitive, especially for freshmen. Many say to apply to ten or fifteen of them. But is it typical to send that many LoRs for one student?
  21. D

    Power absorbed by multiple elements

    Homework Statement Calculate the power absorbed at t=0,t=0+,and t=200 mS by each of the elements in the circuit of fig 11.25 if us is equal to (a) -10u(-t) V (b) 20 + 5u(-t) V Homework Equations The Attempt at a Solution...
  22. marellasunny

    Why is it that acceleration has multiple components in SHM?

    I am trying to understand why in a SHM, the acceleration has multiple components(when actually we create such expressions mathematically by approximating the trigonometric expressions using the binomial theorem).I will explain what I mean to ask below with an example. In a internal combustion...
  23. A

    Weight distribution over multiple scales

    I am in a first year physics course at university, with little background in maths and science. Homework Statement When a dog stands at rest with each of its four feet on a separate set of scales, each scale reads a value of 45n. if this dog then carefully lifts one foot of the a scale...
  24. Z

    Move Point along multiple lines

    Hi, i got problem i am trying to solve. Basicly i got point moving along bunch of lines ( either rectangles/triangles it is custom, generated in code ). I am using this equation to find out x,y coordinates for moving along specific line : (its taken from code ) x = x1 + center.x + (x2 - x1)...
  25. A

    Double slit experiment with multiple sources of particles

    Im somewhat new to modern physics, had one introductory class in my university and because it fascinated me so much, I've watched all the leonard susskind lectures on quantum mechanics, entanglement, and particle physics on youtube on the Stanford channel. Today I noticed something strange...
  26. S

    Engineering Circuit analysis with diodes and multiple current/voltage sources

    Homework Statement This isn't a homework question, just one I can't get the correct answer to. The circuit diagram is attached, and I need to find the voltage at V. The Attempt at a Solution Assume the voltage drop across each diode is 0.6V. Let V_5 be the voltage drop across the current...
  27. M

    MATLAB, single command for multiple columns

    Homework Statement Create the following matrix by typing one command. Do not type individual elements explicitly. \begin{array}{ccc} 0 & 0 & 0 & 0 & 0 \\ 0 & 0 & 1 & 4 & 7 \\ 0 & 0 & 2 & 5 & 8 \\ 0 & 0 & 3 & 6 & 9 \\ \end{array} Homework Equations None The Attempt at a...
  28. B

    Fortran Fortran, passing an array to multiple subroutines

    Hi guys, I am kind of a newbie to fortran and I'd like to ask a simple question. In the code below, I have a main program with one subroutine. It's a simple one. In the main code I am filling an array with elements from 1 to 10. Then I am passing this array to a subroutine "sub", where...
  29. F

    Rank-2 tensor: multiple definitions

    Hi all! In a paper they say that a certain quantity is a rank-2 tensor because it transforms like a spin-2 object under rotations, that is: if the basis vectors undergo a rotation of angle \phi, then this quantity, say A, transforms like A\mapsto Ae^{i2\phi} As far as I knew, a rank-2...
  30. D

    What is the effect of multiple forces on a 2D rigid rectangle?

    Say I have a rectangle of width w and height h centred at (0, 0) on a 2D coordinate plane. The rectangle is free to move on a frictionless medium. It is not attached at any point. Case 1: A single force F = (Fx)i + (Fx)j acts at a point (x, y) How does the rectangle move? I looked it up on...
  31. J

    What is the tension in a pulley system with multiple weights?

    Homework Statement The system is in equilibrium and the pulleys are weightless and frictionless. The weights are 25 N, 4 N, 4 N, and 1 N. Find the tension T. The acceleration of gravity is 9.8 m/s^2. Answer in units of N Homework Equations F=ma The Attempt at a Solution Honestly...
  32. J

    Multiple Choice-Derivatives-Please Check?

    Homework Statement Which of the following is not the same as the derivative of y with respect to x, if y= f(x)? (a) lim as Δx -> 0 of \frac{Δy}{Δx} (b) lim as h--> 0 of \frac {f(x+h) -f(x)}{h} (c) lim as x_1 -> x of \frac {f(x_1)-f(x)}{(x_1-x)} (d) lim as h-> 0 of \frac {f(x) -...
  33. S

    How to get multiple rec. letters

    Hello, this has been concerning me for a while now. I've seen online many testimonials about how important recommendation letters are for acceptance into a graduate program. I only have minimal research experience as of now, and I'm currently working at an internship I will likely be...
  34. E

    Solving Complex Function for multiple solutions

    1. Find all the solutions to the equation z^4 + j^4 = 0 2. z^n = |a|e^j(Θ + 2pik) 3. I really don't know where to start, I thought about j^4 = 1, so z^4=-1. I then simplified to conclude that z^4 = -e^jpi. I am not sure if that is correct and if it is what to do next.
  35. Albert1

    MHB Proving: 2003 Is a Product of Natural Numbers

    $prove :1\times 3\times 5\times---\times 1999\times 2001 +2\times 4\times 6\times---\times 2000\times 2002$ is a multiple of 2003
  36. G

    Multiple Slit Interference and Driffraction Grating

    Homework Statement A five-slit system with 8.4*10-6 slit spacing is illuminated with 610*10-9 light. Find the angular position of the first two maxima, and the 3rd and 6th minima. Homework Equations For Maxima: d*sin(θ) = m*λ θ = sin-1((m*λ)/d) For Minima: d*sin(θ) = (m/N)λ θ =...
  37. D

    Crushing Multiple Cans: 8n Force Needed?

    This is possibly a very silly question, I am not experienced in this field. I am creating a Can Crusher for a project. If it takes 8n to crush a can. Will it still take 8n to crush multiple cans joined together end by end? Also, if multiple cans were being crushed on a platform, against...
  38. G

    Rigorously determining differentiability in multiple variables

    Homework Statement Determine if f(x,y) = ((x-y)4 +x3 +xy2)/(x2+y2) [f(x,y = 0 @ (0,0)] is differentiable at the origin. Homework Equations x = (0,0) The Attempt at a Solution A function is differentiable at x if f(x+Δx) - f(x) = AΔx + |Δx|R(x) Where A are constant...
  39. L

    Project: multiple speakers for an ipod

    Hey all, I am hoping to make a system that can play multiple, varying sized speakers. I want to frankenstein this with speakers I can find around my house. I have a bunch of old computer speakers and even a few subwoofers which I would like to utilize (if possible). I am assuming that I need...
  40. Monique

    How to calculate arithmetic sum of multiple strings

    I have a MySQL database and I have the problem that queries take way too much time. I want to optimize the database and one way would be to save data into a string, instead of in rows (the string would be replicates of the same condition). Each string is an interval of 4 seconds, to reduce the...
  41. J

    Practice Finals Multiple Choice

    I'm looking for some really good an thorough multiple choice practice finals for my Electricity and Magnetism class. anyone have any recommendations? My goal is to get an A on this final and that is going to be very difficult so i need some really good practice. thank you for you help.
  42. A

    Potential Differences and Currents in a Diamond Circuit

    Homework Statement In the figure ε = 15.1 V, R1 = 1560 Ω, R2 = 2130 Ω, and R3 = 4210 Ω. What are the potential differences (in V) (a) VA - VB, (b) VB - VC, (c) VC - VD, and (d) VA - VC? The figure consists of single ideal batter connecting to a diamond shape circuit ABCD. Going clockwise...
  43. N

    Process Engineering - Multiple Evaporators

    Homework Statement Here's a quick sketch of the problem: http://prntscr.com/15ltr5 Essentially, Sugar Solution enters the first evaporator at 65°C and the water is boiled (to 100°C) so that a sugar concentrate comes out (bottom of evaporator) and saturated steam leaves the evaporator...
  44. C

    Trigonometry Problem - Confused over multiple possible angle sizes.

    Homework Statement In triangle PQR, the length of QR is 4 mm, the length of PR is 3.5 mm and the size of angle Q is 60°. What are the possible size(s) of angle P (to 2 decimal places) The possible solutions are 138.81, 81.79, 118.96, 61.04, 98.21 The Attempt at a Solution I've solved for...
  45. J

    3D Rotations - Confused with multiple rotations

    I've been trying to wrap my head around 3D rotations and specifically, Euler angles. I thought I had a good understanding of performing multiple rotations, but after writing a Matlab script that graphically shows my rotations, I am not so sure right now. My biggest hang up is whether or not a...
  46. Astrum

    Definition of Integral in Multiple Variables

    Dyadic Cube C_{k,N} = X \in\ \mathbb{R}^{n} \frac{k_{i}}{2^{N}} \leq x_{i} < \frac{k_{i}+1}{2^{N}} for 1 \leq i \leq n Where k = \pmatrix { k_{1} \cr k_{2} \cr \vdots \cr k_{i} \cr } I understand that N is the level of the cubes, but what does k equal? I'm having trouble...
  47. J

    Does an algebraic function always ramify at a multiple root?

    Hi, Consider the algebraic function w(z) given by the expression f(z,w)=a_0(z)+a_1(z)w+a_2(z)w^2+\cdots+a_n(z)w^n=0 where f(z,w)is irreducible over the rationals, and the coefficients, a_i(z), polynomials with rational coefficients . Let z_s be a point such that f(z_s,w)=0 has roots with...
  48. E

    Do MPI collective operations involve multiple hops?

    Consider the reduce operation for example. Do all nodes send data directly to the root? Or is there some structure where a node will receive data from a few other nodes, perform a reduction, then pass the intermediate results to other nodes?
  49. S

    Problem about the law of multiple proportions (includes solution)

    Homework Statement Problem: Three common gaseous compounds of nitrogen an doxygen of different elementary composition are known, (A) laughing gas containing 63.65% nitrogen, (B) a colorless gas containing 46.68% nitrogen, and (C) a brown, toxic gas containing 30.45% nitrogen. Show how these...
  50. B

    How to find an equation with multiple x,y coordinates

    Hi, I tried using geogebra to find an equation that exactly goes through the list of points I plotted on the graph but I failed to find any way so far. I have tried using, FitExp, FitGrowth, and Fitline, and so far none of them worked. I have no idea what kind of equation this is so I cannot...
Back
Top