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. C

    A kirchoff's law question with multiple batteries

    Homework Statement To find the voltage at the 5 ohms resistor. Homework Equations V=IR Kirchoff's first and second law The Attempt at a Solution The attempt was simply too long I ended up with a voltage of 6.5V on the 5 ohm resistor... Please help me, I have been stuck in this...
  2. R

    Question about Multiple Stream Mixings into Units

    Homework Statement I'm currently doing some thermodynamic analysis. I don't know where to put this question, but here goes: I have a system that has two streams entering a condenser, and one leaving. I don't know mostly anything about two of the streams. One stream I have fully defined...
  3. J

    What is the likelihood of a hijacked ship sinking from an unrelated incident?

    I belong to a group of people who, inter alia, (try to) apply Bayesian Theory to miscarriages of justice eg the recent spate of medical staff arrested when rare (but to be expected eventually) clusters of deaths occur in hospitals. A somewhat opposite case has recently arisen which has generated...
  4. F

    Mathematica Multiple 2D plots in Mathematica

    I posted this first in the homework section, but no one answered it. I figured this might be a better section... I have multiple 1D data sets, let's call them data1, data2, data3, etc. Each data set has the same number of entries. Each one is either a row or a column (I can just use...
  5. G

    What Force Does a Charged Particle Experience in a Magnetic Field?

    Homework Statement A charged particle traveling with a velocity v in a magnetic field B experiences a force F that must be: A. parallel to v B. perpendicular to only v C. parallel to v-B D. parallel to B E. perpendicular to v x B Homework Equations Requires this right hand...
  6. F

    Plotting Multiple 2D graphs in mathematica

    Homework Statement I have multiple 1D data sets, let's call them data1, data2, data3, etc. Each data set has the same number of entries. Each one is either a row or a column (I can just use Transpose[...], so same] and when I use the ListPlot[] function, I get a graph where the vertical axis...
  7. J

    Newton Law Gravitation - Multiple choice question?

    Newton Law Gravitation - Multiple choice question?? Homework Statement Newton’s law of gravitation can be applied to the Earth-Moon system. Which of the following statements is not correct? A The value of G at the surface of the Moon is the same as that at the surface of the Earth...
  8. B

    Understanding the Law of Multiple Proportions

    Law of multiple proportions states that "if two elements can combine to form more than one compound, the masses of one element that combine with a fixed mass of the other element, are in the ratio of small whole numbers" I was thinking how it makes sense. and i concluded this just simply means...
  9. J

    Galvanic protection of multiple materials maintaining electric connection

    I am looking for the best way to prevent corrosion between two different materials while maintaining electrical contact between them. Specifically, I am wondering about carbon fiber panels placed on an aluminum base and exposed to seawater. Carbon (graphite at least) has a much higher galvanic...
  10. J

    Electric field - multiple choice - Physics Unit 4 Specimen

    Homework Statement see attached file Homework Equations The Attempt at a Solution ok so I get that the answer is B but is it because they have the same q/m ratio?
  11. K

    Jacobi Matrix and Multiple Intgrals

    Homework Statement Let D be the set of points (x,y) in R^2 for which 0 is ≤ x ≤ 1 and 0 ≤ y ≤ 1. Find a function g: R^2 --> R for which: ∫_0^1 ∫_0^1 h(x,y)dxdy = ∫_0^1∫_0^1 h(y^5, x^3) * g(x,y)dxdy is true for all functions h: D--> R integrable over D In the question before this I...
  12. A

    Newton's law of cooling with multiple containers DE's

    I've been trying to figure out how to solve the following problem: "A metal bar is placed in a container (call it container A) which is inside of a much larger container (call it container B), whose temperature can be assumed to be constant. Find the function for the temperature of the metal...
  13. D

    Understanding the meaning of multiple integrals

    Homework Statement I am currently taking calc III and we have starting getting into double and triple integrals. I was wondering what you are actually doing when you take a double or triple integral? And what the difference is. I understand that you find area with a single integral and find...
  14. C

    Power, electricity, multiple choice Q

    Homework Statement If you step up the voltage in a wire by a factor of 100, how is heat affected? A. No change B. Heat loss increases by a factor of 10000 C. Heat loss decreases by a factor of 10000 D. Not enough information to tell Answer: "C, heat loss decreases by a factor of 10000...
  15. G

    AP Physics Multiple Choice Question

    5. A force of 12 N is applied tangentially to the rim of a wheel with radius 0.70 m and rotational inertia 3.0 kg-m2. What angular acceleration results? a) 2.6 rad/s2 b) 2.8 rad/s2 c) 3.2 rad/s2 d) 3.4 rad/s2 e) none of these ____6. If the force in question #5 acts for 20 s, what will be the...
  16. L

    Breakdown voltage of multiple materials

    I need to find an equation to figure out the breakdown voltage of layers of materials. In my case it will be air then glass then an inert gas. Any one have any info on how to get this. Thanks.
  17. W

    Multiple Pulleys and Masses with Friction

    Multiple Pulleys and Masses with Friction (Picture Included) Homework Statement http://content.screencast.com/users/Waraa/folders/Snagit/media/2d699ba1-32e0-4d9c-b79f-1a1d85dccd12/03.19.2012-15.49.46.png I have solved the question but I am still iffy as to whether my solution is correct...
  18. J

    A multiple concept problem thermal expansion/stress

    Hi guys! I think I need to explain myself before I ask for the advice :) I'm 27 (so been in grade 12 ages ago) - I didn't have science, I wrote it years later. Now I'm enrolled for a Bsc degree in the hope of getting into medical school (very tough in South Africa). I'm putting a lot of time...
  19. P

    Excitons in Multiple QWs

    I have tried solving for the exciton energy in GaAs/AlAs QWs but my calculated results do not agree with published experimental results. My model in the calculation is just a single GaAs well with AlAs barriers. Using the material parameters of both materials, and the well width, I calculated...
  20. sergiokapone

    Quantum entanglement of spin along multiple orthogonal axes

    I already asked this question on physics.stackexchange.com, but did not get the desired response. I am interested in the opinion of your community. Picture an entangled pair of spin 1/2-spin particles with total spin 0. In the diagram, particle 1 of the pair is moving to the left (-y), and...
  21. D

    The Mystery of Multiple Infinities

    any one universe is infinite. So as there are multiple (parallel right?) universes, how do multiple infinities co exist? Lets say, even conceptually or mathematically? If not parallel, then again, what happens after completion of 10^500 universes?
  22. M

    MHB Wave equation and multiple boundary conditions

    I need to apply D'Lembert's method but in this case I don't know how. How to proceed? Determine the solution of the wave equation on a semi-infinite interval $u_{tt}=c^2u_{xx},$ $0<x<\infty,$ $t>0,$ where $u(0,t)=0$ and the initial conditions: $\begin{aligned} & u(x,0)=\left\{ \begin{align}...
  23. ElijahRockers

    Integration of multiple variables

    Homework Statement Find the volume of the given solid. Under the plane x − 2y + z = 8 and above the region bounded by x + y = 1 and x2 + y = 1 The Attempt at a Solution Here's how I set it up. \int^1_0 \int^{1-x^2}_{1-x} (8-x+2y) dydx When I do the math, I get 21/20. I have...
  24. M

    Difference between multiple normal populations

    Suppose I know that the diastolic blood pressure of my 30 patients is normally distributed with the same mean and standard deviation. Then the odds of one patient having a diastolic blood pressure is x higher than the others is the probability that the observed value of a normally distributed...
  25. C

    Series and parallel circuit with multiple resistors?

    Series and parallel circuit with multiple resistors?? Homework Statement If R1 = 27Ω and R2 = 7Ω : a. What is the equivalent resistance of the circuit? b. What is the current from the battery? c. What is the voltage drop across the R1 resistor? Homework Equations I=V/R ΔV=-IR...
  26. F

    Consultation with field for multiple criteria

    Gentlemen, I have a subform with the following fields: name of the step, the scheduled date, place and date rescheduled date. I'm having trouble making a statement in a query that has the following criteria: need to know what the step is smaller than today's date between the date scheduled...
  27. S

    How to multiplex signal from multiple sensors

    I have a bunch of photodiodes and I want to interface to these to a computer using my sound card. I have 12 sensors and stereo input samples at around 96000hz. My idea is to connect 12 sensors to each line and have them turn on or off at a specified offset so that the total output signal would...
  28. T

    Finding Multiple Roots of Equations

    Homework Statement Hello everyone. My task is to find the largest positive root in a specific interval of a function using the bisection method, Newton-Raphson method, and secant method. I've written code for all three of these methods, but the only way I can find all of the roots is to hard...
  29. A

    Multiple images in gravitaional lensing

    On the subject of gravitational lensing there seems to be two rather different phenomena. The "arc" phenomena seems rather plausible to me, if light is affected by gravity which is natural then there should be able to get that kind of behaviour. But the multiple imaging stuff, seems rather...
  30. T

    Finding Multiple Roots of Equations

    Homework Statement Hello everyone. My task is to find the largest positive root in a specific interval of a function using the bisection method, Newton-Raphson method, and secant method. I've written code for all three of these methods, but the only way I can find all of the roots is to hard...
  31. J

    How Do You Calculate Initial Current in a Multi-Capacitor RC Circuit?

    Homework Statement The circuit used in this problem is attached as an image. I made this in gEDA (the circuit is from the homework problem, I just didn't feel like using a scanner to get the image) The 2-microfarad capacitor shown in the circuit attached is fully charged by closing switch...
  32. J

    Electrolysis when multiple ions present

    What are the products of electrolysis of brine solution? At cathode i know it will be hydrogen But i am confused about the products at anode:- Either water will get oxidised or chlorine. Considering the oxidation potential values - water should get converted to oxygen but practically...
  33. D

    Solving Multiple Integral Homework Statement

    Homework Statement Ok, so I am going to French University, I have to translate in English. There is a hemisphere with the radius of 2. Inside of it, there is an empty space shaped as a cylinder with the radius (a< 2) which is perpendicular to the base of the hemisphere. The density of...
  34. C

    Calc III - Graphing a Function of Multiple Variables by hand

    I come across questions where I have to match the equation with its contour map and graph. Examples: z = sin(xy) z = sin(x-y) Right now I'm using Wolfram Alpha for all of these, but supposing these appear on an exam... how do I graph it by hand? :confused: For example, for z =...
  35. Fredrik

    LaTeX Multiple alignment points in LaTeX

    If I have two strings of equalities within the same align or alignat environment, and the first one is long enough to need two lines, I would want the result to look like A+B+C=D=E =F=G=H I=J rather than A+B+C=D=E =F=G=H I=J Is there a way to do this? I suppose it can be done...
  36. K

    Need help designing multiple voltage and current output from single input

    Hello, I am in the process of designing a voice activate control system for my truck for various things like wiper motors/windows/etc. The development board I am using will have up to 20 outputs @ either 5 or 12V DC around 10mA. However, this is not strong enough to drive a wiper motor or...
  37. G

    HELP WITH AP PHYSICS- 5 min drill Multiple choice easy?

    I need help with all of these. I am so lost on all of them and have been working for hours. Anything is so appreciated. _____1. A rock is dropped off a cliff and falls the first half of the distance to the ground in t1 seconds. It falls the second half of the distance in t2 seconds. What...
  38. E

    Graphing a piecewise function with multiple functions

    Homework Statement Suppose f(x) is a piecewise function defined as follows f(x) = 2x^2+2 ---- > x < 1 = 2x^2 - 3x ----- > 1 ≤ x ≤ 2 = 2 - (6/x) ----- > x > 2 Graph f(x) for 0 ≤ x ≤ 3Find the left and right hand limits of f(x) as x approaches 1 and as x approaches...
  39. N

    Verifying Multiple Regression Calculation

    It's been a long time since I've done (least squares?) multiple regression, is the calculation below correct? y data points 6,054 7,200 6,243 5,536 4,879 y hat = 5,984 x data points 414 351 425 372 328 x hat = 378 Sum of xy's residuals = 39,643 Sum of (x-x hat) squared =...
  40. V

    Circular mass, finding multiple variables

    A 4.0 N and 3.0 N force act simultaneously on a circular mass of .25 kg, initially at rest floating in space. a) Find the net force acting on the mass (magnitude and direction) I found the netforce (Resultant) = 5N b) Find the acceleration of the mass, magnitude and direction. The...
  41. S

    Multiple sets of linearly independent vectors

    hallo I am trying to calculate the probability to obtain 2 sets of linearly independent vectors from a set of binary vectors of length k. For example: k = 4, and therefore I have 2^k = 16 vectors to select from. I want to randomly select 7 vectors (no repetition). What is the...
  42. B

    Engineering Multiple Resistors and Short Circuit

    Homework Statement This is more of a concept question rather than a HW problem, but I have two Circuits shown in the image attached. I am not really understanding how a short would affect resistance in these cases. 2. The attempt at a solution For figure 1 I am considering one of two...
  43. C

    Why can't there be a metal-metal multiple bond in ?

    Why can't there be a metal-metal multiple bond in ... ? [Re2OCl10] 4- Each Re has an octahedral geometry basically, with 5 Cl- attached to it. It also has a bridging O, which bridges the two Re together. O also produces pi donation to each Re, so that there is basically a double bond...
  44. N

    Comp Sci (C++) ubuntu g++ bug: multiple definition of a function. What went wrong?

    Homework Statement I can't understand what's causing this bug. I'm not trying to actually use this program, but it's just something I made up to learn how it works, and understand why things don't work, while I'm learning C++. So my question is, what's causing this program to get this error...
  45. K

    Car collision using multiple formulas

    Homework Statement I'm not sure where to begin with this problem A car is traveling West at 35mph. 45 feet in front of this car is an intersection , and another car is about to turn in front of the westbound car. Could the car safely complete the left hand turn , or would the westbound car...
  46. Q

    An equation with multiple radical radicals.

    Here's a slight brainteaser for you all ! Seems simple at sight but can be harder than you think :D P.S I'm working on it as of now, it's an interesting question. Solve : 1/(√x+√(x+2))+1/(√x+√(x-2))=1/4
  47. U

    Velocity addition formula for multiple velocities within each other

    I am having a problem coming up with an empirical formula for multiple objects moving with the same speed relative to each one up. I.e. there is a cart moving with speed u relative to me, and inside it is a cart moving speed u relative to the cart is inside it. and inside that cart is a cart...
  48. F

    Multiple integral notation (or abuse of?)

    So I've seen quite a variety of notations that deviate from what we've learned in our "normal" math courses. In math classes we write a volume integral as: \iiint_W \rho\, d V but somehow once we start doing E&M and QM, professors often just drop the extra integral signs: \int_W \rho\, d V...
  49. djh101

    Can the amount of product at a given time be calculated with multiple reactants?

    And by calculated I mean calculated in a fairly simple way. Single reactant problems have the integrated rate laws that relate time, final concentration, and initial concentration. However, I can't seem to find anything on calculating concentration at time t in a reaction with multiple...
  50. J

    Fortran Fortran 77 - reading same file multiple times

    Hi all I am using some code that was originally written in F77, but as it is many thousands of lines long, I haven't the time to go changing it. There is one section of code that refuses to work, but I'm assuming it must have at some point since the code has been used in the past...
Back
Top