What is Multiple: Definition and 1000 Discussions

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. X

    B Gravitation with multiple objects by using center of mass

    Four 9.5 kg spheres are located at the corners of a square of side .60 m. Calculate the magnitude and direction of the total gravitational force exerted on one sphere by the other three. So, essentially my question is, why can I not use center of mass of the other 3 spheres to calculate the...
  2. RoboNerd

    Force Systems Multiple Choice Thread

    Homework Statement http://gpschools.schoolwires.net/cms/lib05/MI01000971/Centricity/Domain/272/Chapter%205%20MC%2013.pdf It is problem 22 on page 7 of the document: A block of mass M1 on a horizontal table is connected to a hanging block of mass M2 by a string that passes over a pulley, as...
  3. P

    Geostationary satellite orbit radius as a multiple of Earth radius.

    Homework Statement Okay, so the question seems really simple so I don't know what I'm missing A satellite orbits at a fixed point above the Earth's equator. Assuming the Earth has uniform density, radius R, and angular frequency of rotation, omega Find an expression for eta, such that the...
  4. CynicusRex

    I Monty Hall - Multiple solutions via direct calculation?

    https://en.wikipedia.org/wiki/Monty_Hall_problem#Direct_calculation I understand the problem and why it is better to always switch. Now, I want to prove it by myself via a direct calculation. Before I start I wonder if the direct calculation on Wikipedia is the only solution or are there...
  5. L

    MHB Conditional proof for multiple quantifier

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  6. N

    I Finding multiple roots of polynomial using numerical methods

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  7. T

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  8. Korbid

    How to Numerically Solve a Complex Multiple Integral in Physics?

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  9. C

    Run Lines of Code Multiple Times

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  10. A

    Question about multiple functions for a first order ODE

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  11. RoboNerd

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  12. P

    B Multiple Infalling to Black Hole Horizon: Alice, Bob & Charlie

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  13. sk1105

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  14. V

    How do I interpret multiple principal stresses for 3D loading with shear?

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  15. dubya_80

    Variable speed control of multiple dc motors

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  16. J

    What exactly is a world in multiple world interpretation?

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  17. A

    Finding acceleration in multiple pulley system

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  18. 5P@N

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  19. BobTheFrog

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  20. Albert1

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  21. berkeman

    BATDOK -- Medics monitoring and treating multiple Pts in the field

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  22. mcdavid&goliath

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  23. H

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  24. gfd43tg

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  25. Paul Howard A

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  26. W

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  27. entropy1

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  28. B

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  29. Pizza

    Multiple big bangs in one continuum - Question

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  30. JaredMTg

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  31. T

    Other Problems of pursuing multiple paths

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  32. D

    Exploring Voltage in Series and Parallel Battery Circuits

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  33. S

    Can I Combine Engineering, Physics, and Mathematics in One Career?

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  34. S

    Multiple patterns in SED delete

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  35. C

    Need some checking on these Multiple choice questions

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  36. R

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  37. Sollicitans

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  38. R

    Law of multiple proportions (need method check please)

    Homework Statement Homework Equations Law of multiple proportions The Attempt at a Solution Carbon first: 4.61/0.39 = 11.82 C/H Hydrogen 0.39/4.61 = 0.08 H/C therefore 11.82/0.08 = 139.72 ~ 140 masses of carbon that combine with hydrogen are in a 140:1 ratio Does this look right? Or...
  39. R

    Multiple Measurements of a single Qubit

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  40. 1729

    Multiple choice buoyancy problem

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  41. J

    Mathematica: Animate multiple sets of XY data

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  42. L

    Acceleration and Tension in Multiple Pulleys

    Homework Statement Block "m1" sits on a horizontal frictionless surface. Block "m2" is hanging below the pulleys as shown. All of the pulleys are massless and frictionless. Given [m1, m2]. Determine: a. The tension in each rope. b. The acceleration of each block. Homework Equations Sum(F) =...
  43. J

    Restriction with Multiple Quantifiers

    Homework Statement In the questions below suppose the variable x represents students and y represents courses, and: U(y): y is an upper-level course M(y): y is a math course F(x): x is a freshman A(x): x is a part-time student T(x,y): student x is taking course y. Write the statement using...
  44. goonking

    Some multiple choice questions.

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  45. P

    Ratio control for multiple streams

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  46. A

    3D graph plot of a function of multiple variables.

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  47. Mnemonic

    Calculate Angle for Multiple Polarisers to Reduce Intensity <10%

    Homework Statement You use a sequence of ideal polarising filters, each with its axis making the same angle with the axis of the previous filter, to rotate the plane of polarisation of a polarised light beam by a total of 45°. You wish to have an intensity reduction no larger than 10%. What...
  48. G

    Why can multiple dialectrics be treated as capacitors

    Homework Statement [/B] I have come upon a number of problems where there are two or three different dialectrics inside a capacitor. according to the solutions manual I can often treat the dialectrics as capacitors in series or parallel. My question is why can you treat them as capacitors...
  49. mwspice

    Lagrange's Equation with Multiple Degrees of Freedom

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  50. Telemachus

    Applications of multiple ionization cross sections

    Hi there. I'm working with this stuff of multiple ionization (in particular, double ionization). There are some references I've found on the applications in applied physics for this theoretical work, for example, plasma physics, accelerator physics, radiotherapy, which are listed in some papers...
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