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.

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  1. L

    Uncertainty For Multiple Measurements

    Homework Statement We needed to measure the temperature of a bucket of water using a thermometer which can be read to 0.1°C. Each group would do a single measurement, the data from five groups (including our own) was to be averaged with the uncertainty stated. The data collected was: 19.5...
  2. A

    Genetic sequence multiple choice question

    Homework Statement 5) Examine the following sequence: 5' GAATTC 3' 3' CTTAAG 5' If this sequence was disgested with an enzyme (ex. ECOri) which cut between the guanine and adenine bases on which would it have? A) 3' overhang B) Blunt ends C) 5' overhang D) Any of these Homework Equations n/a...
  3. D

    Integration of Multiple Variables

    Hi There, I'm a new member, so apologies if I've posted this in the wrong area. I've been working through the ASME STS-1-2006 Steel Stack Standard, particularly the Vortex Shedding section. I've come across this nasty integral which is doing my head in, and we wondering if anyone would mind...
  4. S

    MHB This is the formula for finding the area of a circle, where r is the radius.

    hi guys.. i have a new challenge ...how to find are of circle.. like this ... any body could help me, thanks so much.. susanto
  5. C

    Multiple linear regression

    I am doing a multiple linear regression on a dataset. It is test scores. It has three highly correlated variables being income, reading score, and math score. Obviously since the test score is the sum of the math score and reading score would it be appropriate to exclude them simply based off...
  6. Ghostcrown

    Could a photon activate multiple photomultipliers at once?

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  7. S

    MHB Find Area Problem in Multiple Choice Question

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  8. R

    Multiple universes: Nothing more than philosophising?

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  9. acdurbin953

    Comparing the current through multiple batteries

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  10. Lobos

    Universal? or Multiple Units of Measure?

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  11. S

    MHB Find Mean With Multiple Data [Shortcut]

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  12. JasonHathaway

    Solve Multiple RLC Problems: Currents & Voltages

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  13. X

    Treating multiple objects as the same system

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  14. T

    Definition of a multiple within a probability problem.

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  15. Feodalherren

    ME Dynamics - Multiple ideal pulleys + an inclined plane

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  16. P

    Does each band have multiple allowed E-values for th same k?

    So every theoretical resource I've been able to find seems to map bands to lines for a 1D crystal, surfaces for a 2D crystal, and hypersurfaces for a 3D crystal. But then there are images like the ARPES data below (fig. 1a, 1b, 2) where the density of states is a lot higher within the valence...
  17. I

    Software for "connecting" and plotting multiple equations

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  18. A

    Multiple Power Source Circuit Analysis

    Homework Statement Compute all the currents labeled using the mesh loop method. Homework Equations Parallel Resistors 1/Rt=1/R1+1/R2...+1/Ri Series Resistors R1+R2...+Ri The Attempt at a Solution My attempt at the kvl and kcl analysis, I think I did this wrong because I can't solve for...
  19. terryds

    Understanding the Velocity and Acceleration of Blocks Linked by Multiple Pulleys

    Homework Statement http://www.sumoware.com/images/temp/xziltxnrjlckqjqs.png Two blocks ( A and B ) are linked by rope through three identical pulleys C, D, and E. Pulley C and E are in stationary, while D is pulled down so its constant velocity 1 m/s If vA = 4m/s when A goes down 2 m...
  20. J

    Tension in string in system with multiple objects?

    Homework Statement I am stuck on this problem: So the question is asking for F21, F12, F32, and F23. (That's the force by 2 on 1). The mass of m2 is variable. There are four cases where I need to solve for the forces: when m2 has mass of 3kg, 0.3kg, 0.03kg, and 0kg. The mass of m1 = 2.5kg, the...
  21. G

    Exploring the Effects of Multiple Tubes on Induced Current in Lenz's Law

    Obviously if a magnet falls down a conducting tube, it induces a current in the tube. But what if you surrounded the tube with other identical tubes in parallel with the first one so that they're touching, and then wrapped wire around those other tubes? Would the current induced in the wrapped...
  22. psuedoben

    Could multiple dimensions explain quantum leap?

    please point out the flaws/add to my reasoning here: it is known that energy is quantized, but could that be for just the 3 dimensions we're able to experience? Is it illogically to propose that energy might not be quantized when looking at all of the dimensions together? this could explain...
  23. FuturePhysicist

    Physics Can a theoretical physicist do multiple fields?

    Based on what I have learned, I know that a theoretical physicist has to work in a specific field. But can one work in two? For instance, a person who has a PhD in cosmology but is working on both cosmology and field theories (quantum, unified). Or maybe even the same person working at a...
  24. G

    Multiple Scattering in High Energy Physics Experiments

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  25. Q

    Possibility of multiple moons in Earth-Moon system

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  26. K

    How do I determine shaded cells in K-tables for minimizing multiple outputs?

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  27. blue_leaf77

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  28. S

    Why is ABCDEFA considered a closed loop even with the presence of conductor BE?

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  29. I

    MHB Easy Question On Multiple Choice.... Confused

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  30. S

    Uncertainty in spin on multiple axes

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  31. J

    Is Multiple batteries for efficiency the answer?

    Hello, concerning power supplies. I am at the stage where all the components are ready except for the batteries. The thing is, not all the components have the same voltage. My first thought was using a high voltage battery connected to a custom made Power Distribution Board which splits and...
  32. W

    Prove that the difference of x^3+y and y^3+x is a always a multiple of 6

    I recently came across a problem that said 'prove that the difference of x^3+y and y^3+x is a always a multiple of 6, given that x and y are integers'. I tried it, but I'm not sure if this is a valid proof. this is with the first triangular number being 0 and Tsubn being the nth triangular number.
  33. F

    Multiple images in a thick mirror

    I understand that 4% of the light is reflected back from the glass surface in a thick glass mirror. But why 4%? Why not 5% or 10%? Will this percentage change if the glass has a lower refractive index?
  34. K

    Extended Extreme Multiple Reissner Nordstrom Black holes

    I have a question about equation 10.21 in "Exact Space-times in Einstein's General Relativity" by Griffiths and Podolski. The equation is the well know standard metric for multiple extreme Reissner Nordstrom black holes. It has the below term: (1+ sigma(mi/ri)) The point ri = 0 is of course...
  35. A

    Do multiple lens cameras refract light differently to a single lens ones?

    Why do high end camera modules have so many glass lenses, apart from the necessary lenses for focus and zoom why is it that in cameras like DSLR cameras there are so many low power lenses where a few high power ones would work do the same job, do the lenses diffract light differently when...
  36. B

    Under pressure -- flow rate through multiple holes in a pipe

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  37. I

    C/C++ Adding Vectors in C++: Example Code for Summing Elements with an Offset Amount

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  38. M

    How do I create multiple web pages?

    I heard that a website is made up of multiple web pages and I know how to make a web page in Notepad++ with the languages HTML and CSS but how do I create multiple web pages?
  39. I

    MHB Double & Triple Integrals: Same Solution?

    when taking double or triple integrals, do you get the same solution no matter which variable you integrate with respect to first?
  40. T

    Generalising the Ising model to multiple spin values

    My tutor asked us today to consider the partition function of the following model as an aside to our topic at the moment. I went to work out the maths of it today and I'm quite stuck for how the calculation can proceed. It's a 1d closed chain with some number, n, points. Each point has some...
  41. F

    Total angular velocity of multiple bodies

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  42. J

    Frictionless Multiple Body Problem with Inclined planes

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  43. Vigardo

    Runing multiple instances of Ansys Mechanical at the same time

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  44. W

    Help with two multiple choice questions related to light and interference

    Homework Statement A thin film of glass is in flush contact with a thin film of transparent plastic that has a higher index of refraction than the glass. Monochromatic light of a certain frequency is shown on both sides of this combination, and there is very little light reflected from either...
  45. M

    Find a Rigorous Calculus of Multiple Variables Book for Advanced Learners

    Hi! I am looking for a very rigorous book on some of the topics covered in Calculus of Multiple Variables. My University uses the last part of Adams "Calculus: a complete course" and I found the presentation therein more fit for people needing to know enough to perform the calculations than for...
  46. Hijaz Aslam

    Taking the components of a system containing multiple vectors

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  47. U

    Proving Determinant of Matrix Unchanged by Adding Columns

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  48. J

    Java Why does the output show 1 and not 3?

    Consider the following java code int a=1; if (a != 0) { int a=3; } System.out.print(a); What is the output A. 0 B. 1 C. 3 D. No output. A compilation error occurs The answer is B. I want to ask why the output shown will not be 3. As the 1 is not equal to 0, should the ' int a '...
  49. H

    Acceleration in a Multiple Pulley System

    So if you have two masses connected by a massless string in a multiple pulley system as shown below, the acceleration will be different right? I ask because when doing normal pulley problems where two masses are connected by a single thread, you assume the acceleration is equal, though the net...
  50. D

    Challenge Connecting Multiple Smartphone Mic's Simply & Quickly

    Dear Readers, I'm facing a pretty interesting challenge, which is: "How to connect multiple smartphone mic's in the quickest and simplest way?" Here is a use case. I go into a meeting with a group of random (strangers) that all have smartphones, Android, iOS, Windows. Now I want to record this...
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