What is Loops: Definition and 273 Discussions

Froot Loops is a brand of sweetened, fruit-flavored breakfast cereal produced by Kellogg's and sold in many countries. The cereal pieces are ring-shaped (hence "loops") and come in a variety of bright colors and a blend of fruit flavors (hence "froot", a cacography of fruit). However, there is no actual fruit in Froot Loops and they are all the same flavor. Kellogg's introduced Froot Loops in 1963. Originally, there were only red, orange and yellow loops, but green, blue and purple were added during the 1990s. Different methods of production are used in the UK where, due to the lack of natural colourings for yellow, red and blue, Froot Loops are purple, green and orange, and the loops are also larger in size. Although the marketing side of Kellogg's misleadingly sold the idea that each individual loop color was a different flavor, Kellogg's has acknowledged that all share the same fruit-blend flavor.

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  1. L

    MATLAB How to Create Geometry Loops in MATLAB/COMSOL?

    Hi I'm a new user in Comsol and Matlab and I have to create boxes within a box. Of course those boxes are easy, my problem is how do you make loops in MATLAB that translates to the g1=rect2(blah blah) g2=rect2(blah blah).. For example: The boxes within the outside box varies so it's better...
  2. C

    Matlab matrix selection of data using for loops and if statements ,,

    matlab matrix selection of data using for loops and if statements,,,,, Hi people I was wondering if someone could assist me with the following; You received the following data values from a coworker: data = [-1.2, 3.3, 5.1, 0.2, 2.9, -0.1]; It turns out that the sensor used to collect...
  3. J

    Wire Loops, Current, Magnetic Field, & Straight Wire HELP

    This problem deals with current and the magnetic fields of these wire loops & straight wires. The question is listed below, as is the link to the picture. Thanks SO Much for your help! http://i597.photobucket.com/albums/tt59/JMoore4116/PHY232--Ch31--5-4.jpg If that one doesn't work, try...
  4. V

    MATLAB Vectorizing Simple Loops for Faster Execution Time in MATLAB

    Hie all Can anyone please help me with this problem I need to vectorize the following MATLAB code : for c=1:3 h = randn(3,3) + j * randn(3,3); z( :, :,c) = h; end Im basically trying to create a 3-D matrix - which has 3 , 2-D matrices (these matrices contain radomly generated complex...
  5. B

    Magnetic Fields and Current Loops

    Homework Statement A long, straight wire carries a current of 14 A. Next to the wire is a square loop with sides 1.0m in length. The loop carries a current of 2.5A in the same direction as the wire. Calculate the net force acting on the wire. Homework Equations Magnetic Field for...
  6. L

    IElectromagnetism - Inductince in two small wire loops

    I'm only stuck at the very end of this quesstion but ill wirte out the whole thing anyway. Two tiny wire loops, with (vector) areas \vec{A_1},\vec{A_2} respectively are separated by a p[osition vector \vec{r} with r^2>>A_1,A_2 a) Treating the loops as magnetic dipoles, find their mutual...
  7. D

    MATLAB Can someone help me optimize my MATLAB code by vectorizing loops?

    Could someone please tell me how to make the following code in MATLAB more efficient? I am particularly keen to remove the for loop, as I understand that vectorizing the loop makes the program run much faster. Here ret and len are positive integers and pm is a number between 0 and 1. X is a...
  8. S

    Kirchhoff's Voltage Rule loops

    I set this circuit up in my physics lab and measure all the required voltages, currents and resistors. I have been ask to prove that Kirchhoff's Voltage Rule is valid by applying it to all 7 loops. I am only able to find 3 loops and I am unsure as to where the other 4 are. I found 4 other...
  9. C

    How to measure current induced through loops

    I'm doing some experiments, and I need to measure the current (and/or voltage) going through several loops of wire as a magnet slides through. The magnet slides parallel under the loops at a certain speed. I have a multimeter and an ammeter. The problem with the ammeter is that it's just a...
  10. F

    Fortran Fortran complex numbers and do loops

    I have a very simple question, but have been unable to find an answer for it. When using fortran 90 can you use a DO loop to calculate a complex number? For example: [code] COMPLEX FUNCTION forwards (tincdum,tstartdum,tenddum,fdum,ydum,idum,wdum&...
  11. J

    Roller Coaster Hills and Loops

    Homework Statement A roller coaster begins with a steep downhill descent followed by a vertical loop. How much higher does the initial hill have to be to than the height of the loop so that the riders experience a force of 1G keeping them in their seats at the top of the loop? Assume that...
  12. MathematicalPhysicist

    Will the Large Hadron Collider refute nonstring theories of quantum gravity?

    So, what are the theories' predictions which are going to be tested on LHC? And if they won't be found, Does it mean they will be refuted or not?
  13. C

    Why Does the Same Dice Result Repeat in My C Program's While Loop?

    Homework Statement Write a program that will roll a pair of six-sided dice (int variables named redDie and blueDie) and will give you 5 points every time you roll doubles (pair of 2s, 3s, 4s, and 5s) and 10 points if you roll snake-eyes (pair of 1s) or boxcars (pair of 6s). Run your program...
  14. K

    How Does Lenz's Law Determine Current Direction in Moving Loops and Magnets?

    Homework Statement The figures below show two different situations where a current may be induced in a loop according to Faraday's Law, with the direction given by Lenz' Law. The magnetic field is shown by the x's in Fig. 2. Select ALL correct answers (i.e. B, AC, BCD) for the current in the...
  15. E

    Showing forces between 2 current loops are in accord with Newtons 3rd law

    Homework Statement show that the forces between two current loops obey Newtons 3rd law. Homework Equations \textbf{F}_{12}=\frac{\mu I_{1}I_{2}}{4 \pi s^{2}} d\textbf{r}_{1}\times(d\textbf{r}_{2}\times \textbf{s}) s is the distance between the elements of current The Attempt at a Solution...
  16. A

    Use Kirchoff's loops rule in the circuit?

    The emf given -\frac {d \Phi}{dt} produces a non conservative field right? Then is it right to use Kirchoff's loops rule in the circuit? Also if a coil with self induction L, is kept in a constant magnetic field perpendicular to the plane of the coil, and the flux associated through the coil...
  17. T

    C++ Classes: Loops in Constructor

    Hello! I'm experimenting with classes in C++. It works fine for now, but there is something I can't find an explanation for. I tried to develop a 'matrix' class, and I overloaded some operators in order to define addition or multiplication for matrices. This works like a charm, except for the...
  18. F

    Magnetic Field Using Amperian Loops inside a wire

    Homework Statement There is a cross-section wire or radius R with a uniform current density j flowing through it. There is a hole in the wire's cross section (a vacuum) a distance b away from the centre of the cross section. The hole has radius a. What is the magnetic field B in the hole as a...
  19. marcus

    Loops Foams Workshop (3-8 March Zakopane)

    http://www.fuw.edu.pl/~kostecki/zakopane08/ Last year about this time there was a Zakopane Quantum Gravity School, we got some great pictures reports and comment from Francesca, F-H, Alejandro Satz, and also the main coordinator Richard Kostecki posted some here at PF about it. Zakopane is a...
  20. B

    HELP with current in loops and solenoids

    Homework Statement You have a 1.1-m-long copper wire.You want to make an N-turn current loop that generates a 1.66 mT magnetic field at the center when the current is 1.01 A. You must use the entire wire. What will be the diameter of your coil? Homework Equations The Attempt at a...
  21. B

    Calculating Number of Loops in Coil 2

    Homework Statement In each of two coils the rate of change of the magnetic flux in a single loop is the same. The emf induced in coil 1, which has 200 loops, is 2.67 V. The emf induced in coil 2 is 3.78 V. How many loops does coil 2 have? Homework Equations E=-N(delta Phi/delta t)...
  22. B

    Infinite Loops - Symbolic Computer & The Human Mind

    Im curious if anyone knows if it is theoretically possible to place the human mind into an infinite loop in a similar manner to the placing an electronic computer into one. If not, why? What is principle physical/neurological process that prevents this from occurring?
  23. A

    A quick question about current loops

    Applying the Biot-Savart eq'n for inside a current loop is pretty simple to find the magnetic field inside a current loop. But how would one find the magnetic field outside of one?
  24. R

    Are all lines through space also loops?

    Given the curvature of space-time, are all lines through space also loops? If so, are the loops always circular? If the loops are not always circular, what determines the shape of the loops?
  25. marcus

    Smolin's Loops 07 talk is up (slides and audio), looks like a biggie

    http://www.matmor.unam.mx/eventos/loops07/talks/PL5/Smolin.pdf http://www.matmor.unam.mx/eventos/loops07/talks/PL5/Smolin.mp3 The Loops 07 website continues gradually posting the slides and audio of the talks and several very interesting new ones are now online as of 14 August. I just...
  26. K

    Quantum Loops: Solving the Particle-in-Potential Problem

    Let be a classical particle with Hamiltonian \pi _{t}-p^{2}-V(x)=0 can we describe the QM version of it (particle under the influence of a potential) using 'Loops' instead of Waves ?? i mean, although this is a toy model can we apply 'Quantum Loops' to solve the problem ??
  27. marcus

    I'm excited about Martin Reuter's Loops '07 talk, comments on it?

    Alejandro Satz blog has comment on Reuter's Loops '07 talk Also several people have remarked about what Reuter had to say in his lectures at the Zakopane QG school earlier this year. It made a big impression on the grad students there. I have listened to his Loops '07 talk several times while...
  28. marcus

    Loops '07 has slides for the talks (some audio as well)

    http://www.matmor.unam.mx/eventos/loops07/ click on "program"
  29. R

    Making domed/half sphere closed loops for EDS.

    How can I wind magnetic wire around a half sphere so that I end up with closed loops? How can I wind magnetic wire around a half sphere so that I end up with individual closed loops? There may be a better way to accomplish this so any suggestions would help a great deal. The way I would...
  30. marcus

    QG2 2008: International Conference on Quantum Geometry and Quantum Gravity

    The dates are already set June 30 - July 4, 2008 This time it will be correctly called the Conference on Quantum Geometry and Quantum Gravity---more accurate than just saying "Loops"--- and will be hosted at the University of Nottingham. http://www.maths.nottingham.ac.uk/qg/Meetings.html...
  31. marcus

    List of plenary talks at Loops '07 conference

    Registration deadline for Loops '07 is coming up deadline for early registration is 25 April late registration in May. Looks like most splendid Loops conference yet (even includes string as a small auxilliary sub-department :smile: See Rozali's talk further down the page) TOPICS COVERED *...
  32. D

    How Do You Calculate Torque in a Current Loop with a Hanging Mass?

    Homework Statement The 10-turn loop of wire shown in the figurelies in a horizontal plane, parallel to a uniform horizontal magnetic field, and carries a 2.0 A current. The loop is free to rotate about a nonmagnetic axle through the center. A 50 g mass hangs from one edge of the loop...
  33. G

    Solving 210 V Homework Equations with Multiple Loops

    Homework Statement Well the only thing the problem gives is 210 V Homework Equations Q=VC series Q=Q=Q.. V+V=V 1/C=1/C+1/C.. parallel Q+Q+Q.. V=V=V.. C+C+C.. around a loop the voltage is zero. The Attempt at a Solution Now I have no where to begin. I can see three...
  34. R

    MATLAB Matlab - I am having problems with iteration (loops)

    Homework Statement Hi. I sort of doubt that anyone will reply to this post since it is a MATLAB problem, but ill give it a shot. I am trying to write a MATLAB function that will graph the logistic map. Homework Equations x(n+1) = r*xn*(1-xn) (1) The inputs are r, x0...
  35. A

    Comp Sci Creating Triangles Using Do..While Loops

    Hey, Im pretty new to c++ so my knowledge is limited. I have been set an assignment to create the following triangles only using Do...While loops. I'm having difficulty trying to code it. The underscores are just their to illustrate spaces. 1 *_________________5 * 5__________* * * * 1 *...
  36. D

    Why Do Roller Coasters Have Oval Loops?

    Roller Coaster loops! does anybody know why do roller coasters have more of an oval loop then rounded loop? Thankss
  37. W

    Troubleshooting Platinum & Iridium Loops: Reasons and Solutions

    HI I have loops made of 85% platinum and 15% iridium. It brokes down after 3 or 4 steralization cycles (by getting red on Bunsen Burner) please advice reason and solution thanks
  38. marcus

    Particles as loops (new Freidel paper)

    I expect this to turn out to be an important non-string QG paper this year. http://arxiv.org/abs/gr-qc/0607014 Particles as Wilson lines of gravitational field L. Freidel, J. Kowalski--Glikman, A. Starodubtsev 19 pages "Since the work of Mac-Dowell-Mansouri it is well known that gravity...
  39. D

    Does integration of quantum loops become a string theory?

    Is it possible to integrate quantum loops into helical quantum loops which might be related to twistor string theory? Wilson lines / loops are common to both quantum loop gravity [QLG] and the various string theories [ST]. As I attempt to understand QLG and ST, I developed some speculative...
  40. P

    MATLAB How to Correctly Implement Nested Loops for Surface Plotting in MATLAB?

    Hey guys, Is there anyone good with MATLAB for loops? I am having trouble with getting an embedded loop within another loop to work. I am trying to vary two parameters and create a surface plot with a third variable as the dependant. What I really need help with is how to get the LHS...
  41. D

    How do ‘quantum loops’ differ from ‘Wilson lines’?

    As I attempt to understand the conflict between Quantum Loop Gravity [QLG] and the various types of string theory, I noticed that quantum loops appeared to be very similar to Wilson lines, sometimes called Wilson loops. Speculation: relating [QLG] to twistor string theory [TST]. 1 -...
  42. M

    What is the cause of coronal loops?

    I'm trying to ascertain if there is any "consensus" on the cause of coronal loops in current theory?
  43. B

    Pascal Loops: A Quick Guide for the Bewildered

    i just can't do loops in pascal. the handout we're given doesn't make any sense, so can someone give a quick guide on how to do it?
  44. ranger

    C/C++ Help with C++ for Loops & Patterns

    I need some help. So far I have some for loops that print the following patters: * ** *** **** ***** ****** ******* ******** ********* ********** and ********** ********* ******** ******* ****** ***** **** *** ** * Here is the code: for(int rows=1;rows<=10;rows++) { for(int...
  45. P

    Why do magnetic fields form closed loops?

    I am sorry to be bothering you - I am a high school student and I need help with something I don't understand. It is understandable if we think of why magnetic fields form closed loops if we think of the North and the South Poles not being separate from each other. This has been given as a proof...
  46. Q

    Help with Loops & Currents for Exam Revision

    Help - Loops Currents. :( hey there I'm revising for an exam and i can't really do loop currents i was trying to do this sum http://mathonweb.com/help/backgd4.htm (example2) but kept getting the rong sign for equations (for shared resistors):( could someone please explain to me! thanx in...
  47. S

    Cosmic String Loops & Straight Pieces: Exploring the Unknown

    I've been reading on cosmic strings lately and discovered that if they exist they could pinch themselves off into tiny closed loops that would evaporate via radiating gravitational waves. What would happen if a straight piece of cosmic string could be created? Say, for this question, it's 4...
  48. marcus

    Loops '05 recorded talks now available

    go here http://loops05.aei.mpg.de/index_files/Programme.html click on whoever's talk you want to hear Rovelli and Smolin have the SLIDES as well as the recorded talk. the slides (either pdf or powerpoint) are quick to download and give a quick idea of what the talk was about---where it fits...
  49. K

    Trees to Loops: Computing SUSY Yang-Mills Amplitudes

    From Trees to Loops and Back Andreas Brandhuber, Bill Spence, Gabriele Travaglini 49 pages, 17 figures http://www.arxiv.org/abs/hep-th/0510253 We argue that generic one-loop scattering amplitudes in supersymmetric Yang-Mills theories can be computed equivalently with MHV diagrams or with...
  50. marcus

    Is Loops '06 the Future Name for Quantum Gravity Conferences?

    "Loops" has become a defacto provisional collective name for all the main efforts to get a nonperturbative backgroundindependent theory of QG. If these approaches are going to coalesce into one broad field of research and have an annual meeting, should it be called Loops '06 like it was this...
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