Loops Definition and 275 Threads

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. Kevin Anderson

    Is there a possibility that time loops exist?

    I'm filmmaker, currently I'm writing movie about time loop. My question is, is it possible for time loop to happen? What can cause it? and is there any scientific explanation behind it?
  2. K

    Inductive charging: Emf induced in two coil loops

    Homework Statement So I'm trying to figure out this problem: The base of our charging station is composed of a coil with N1 turns and area A1 connected to a 120 VAC, 60 Hz source. The device has a smaller coil with N2 turns and area A2, which when attached will fit completely inside the...
  3. A

    C/C++ Print Theater Seats in C++: numRows & numCols

    Given numRows and numCols, print a list of all seats in a theater. Rows are numbered, columns lettered, as in 1A or 3E. Print a space after each seat, including after the last. Ex: numRows = 2 and numCols = 3 prints: 1A 1B 1C 2A 2B 2C This is what I have so far, but I can't figure out how to...
  4. sukalp

    What is online test series for exams?

    i wanted to ask you that i am having financial problem for preparing for exams for getting admission into international universities. are there online test series for physics,chemistry,maths in free
  5. AlgoJerViA

    Time loops, black hole and time dilation.

    Hi I hope this is the right place for this questions, I started to think about this several years ago but had has a hard time finding anyone that's been interested in discussing this. As far as I understand time travel is not ruled out by modern physics at least if you limit yourself to go into...
  6. J

    Why Does MCNP5 Behave Differently Across Operating Systems?

    I recently installed MCNP5 on rocks cluster running centOS 6.5, with mpich2-1.4.1p. While running simulations, MNCP5 is stuck in loop in 2 of the simulations. When I tried to perform one of the stuck simulations on windows with mpich-1.2.4, it didn't stuck. Can anyone guide me why MNCP5 is...
  7. Quadrat

    Induced emf in various rectangular loops

    Homework Statement [/B] Three conducting loops, all with the same resistance ##R## move towards a uniform and constant magnetic field, all with the same velocity ##v##. Their relative sizes can be identified by the grid. As the loops move into the magnetic field an induced current begins to...
  8. K

    Calculating the Number of Loops in a Solenoid: A Scientific Approach

    Homework Statement A solenoid has a radius of 10 cm and a length of 50 cm. What I need to know to begin the problem is the number of loops ion the solenoid. Homework EquationsThe Attempt at a Solution One turn will have a length of 2(pi)r. I need to know the thickness of the wire around...
  9. H

    Current induced in concentric superconducting loops

    Homework Statement Suppose you have two superconducting loops, concentric, in a plane. Also suppose that their radii, R2 (outer) and R1 (inner) have the same order of magnitude (so you can't assume B through the inner loop is constant everywhere over the inner loop's surface.) If a constant...
  10. L

    Can I use a for loop to end after entering a desired number of integers?

    I'm wanting to take user input and store it into an array.There is a a minimum and maximum number of input but otherwise the user should be able to enter any number of integers in between. Say the max number is 10 but I only want to enter 5 numbers. I used a for loop but it only ends if the...
  11. komarxian

    Rollercoasters and Loops and Normal Forces

    Homework Statement <I will attach a diagram below> In terms of m, g and r. FInd the normal force at the top of the loop. Homework Equations ∑F = Fc = FN+Fg ∴ Fc=FN+Fg ∴FN = Fc - Fg ∴ N=mV2/r - mg The Attempt at a Solution Fc=mV2/r - mg and V2=ra and a=g ∴C=mrg/r ∴C = mg ∴mg-mg=N ∴ N=0 N. BUT...
  12. A

    Magnetic field lines form loops?

    Apart from the orientation of a compass needle and the pattern formed by iron filings, what other proof do we have of magnetic field lines forming loops?
  13. S

    MHB Understanding nested for loops when decrementing

    Hello! :-) I am having a hard time with understanding the logic behind decrementing nested for loops. The review problem I'm dealing with is below. This one makes the numbers go backwards. #include <iostream> using namespace std; int main(){ for (int i = 0; i < 5; i++){ for (int j = i; j >=...
  14. jk22

    Why Not Local Loops? Reasons Explained

    Once i did the following : for (int i=0;i <100;i++) {...} Hence with the i defined only in the loop and the professor told me we shall never do that. Do you know any reason ? Thanks.
  15. M

    Wrongly applying Faraday's Law to time changing loops

    Faraday's law is $$\nabla \times \mathbf{E} = - \frac{d\mathbf{B}}{dt} $$ If we let our time dependent surface be ##\Sigma(t)## and its boundary ##\partial \Sigma(t)##, then by Stokes' theorem $$ \oint_{\partial \Sigma(t)} \mathbf{E} \cdot d\boldsymbol{\ell} = - \int_{\Sigma(t)} \frac{\partial...
  16. R

    Calculating Inductance of a Solenoid with Multiple Isolated Loops

    I found this formula to approximate the inductance of a coil of wire. But what if a solenoid were composed of N separate loops, where each loop of the solenoid is connected to its own battery? That is, what if the solenoid had the same number of loops and the same geometry, except that each loop...
  17. TheMathNoob

    Understanding Feedback Loops: Temperature and Forest Area

    Homework Statement I am just wondering if my analysis of the following feedback loops are right. The invariant in this case is Temperature Solar heating->Temperature->Evaporation cloud cover-> albedo->Solar heating Second feedback loop Invariant forest area Forest area->Plant...
  18. J

    PID loops or Complementary filter for University project?

    I am studying "maths III" in my university. And the course has this project you have to do called "Practical differential equations". You are basically supposed to describe some practical system that uses differential equations. My thought was PID loops, but I'm not sure if they use...
  19. fluidistic

    Question regarding current loops - electric dipole radiation

    Homework Statement ; attempt and equations[/B] Many times I face problems with a wire loop with some current (which may or may not depend on time, which may or not move) "flowing" in it. And I'm asked to calculate the radiation due to it. So using the multipole expansion I know that the dominant...
  20. fricke

    Magnetic Fields & Loops of Current: Explained

    **Not a homework question. In my professor note, it says that: "If a material causes magnetic field (in parallel direction to the surface charge) below a boundary is not the same as the boundary (in parallel direction to the surface charge) above the boundary, then a surface current is...
  21. T

    Matlab code running loops to meet conditions

    Homework Statement This is not homework but I am trying to solve a problem to see to general a set of numbers for the grassmanian equations to use in something else.[/B] I have five variables a,b,c,d,e. a-b,a-c,a-d,a-e,b-a,b-c,...etc so that none of them are the same so it generates all...
  22. marcus

    Leading lines of development in LQG, main issues, Loops 15

    The Loops conference held every two years, or so, gives us a good window on what the active lines of development are, what the organizers consider the main issues to be addressed and who they see as leaders in the various LQG research areas. LQG is a research community rather than a single...
  23. W

    Induced EMF in Coaxial Loops: Calculating Separation Distance

    1. A very large loop of metal wire with radius 1meter is driven with a linearly increasing current at a rate of 200amps/second . A very small metal wire loop with radius 5centimeter is positioned a small distance away with its center on the same axis (the loops are coaxial). The small loop...
  24. Feodalherren

    MATLAB For Loops Homework: Solving Arbitrary Matrices

    Homework Statement Homework Equations - The Attempt at a Solution I've been trying several different ways but I just can't seem to figure this one out. It seems to me like I will need nested for loops, which we haven't learned yet. The way I read the question is that this program needs to...
  25. M

    Java Help with a pattern using nested loops (java)

    Hey so I have to make a pattern in the shape of a diamond as follow: 1 123 12345 123 1 So first, I wrote the code without using a variable n as the number of rows ( from an input from the user) but just the constant i = 5 ( I am sorry for the variable names, I made many patterns and...
  26. A

    Python Python checking numbers in a given name

    Homework Statement I need to write a Python program, which would: 1) Ask for a name (input function) 2) Keep asking for the name if it is not entered correctly(if it has a digit in it) 3) If the name is entered correctly it will print the name Homework Equations How should I continue the...
  27. F

    Induced Magnetic Fields and Force Between Two Opposing Current Loops Explained

    Homework Statement Except for the loops -- and the fact that current runs through them in opposite directions -- DISREGARD THIS DIAGRAM Two wire loops have current traveling in opposite directions. My problem asks me to determine whether a force exists between both loops and, if so, then in...
  28. S

    Which of the loops would feel a magnetic force directed to the right?

    Problem: The figure shows a region of uniform magnetic field out of the page. Outside the region, the magnetic field is zero. Some rectangular wire loops move as indicated. Which of the loops would feel a magnetic force directed to the right? Attempted Solution: By right hand rule none of...
  29. Dishsoap

    Energy stored in two loops of current

    Homework Statement Derive equation 8.43 (given below). The equation shows the internal energy stored in a system of two current loops, one of radius b with current Ib and one of radius a with current Ia. The currents are spinning in the same direction, the loops are parallel, and they share...
  30. K

    Voltage Output from AC Generators with More Loops

    Hello, I don't understand how more loops in the AC generator create bigger voltage. I understand when we talk about magnetic flux how it happens (rate of change of surface that's penetrated by field lines), but there's also the explanation that says "if the magnetic field penetrates the paper...
  31. I

    C/C++ Does This 'for' Loop in C++ Cause an Error?

    does this result in an error? for (i = 0; i < itemsLast.size(); ++i) { itemsList.at(i) = itemsList.at(i+1); }
  32. L

    How High Must the Brass Ball Start to Complete the Loop-the-Loop?

    Hi everyone, I've been working on this problem for a while now, and I was hoping someone here could point me in the right direction. Here goes: 1. Homework Statement A solid brass ball of mass 0.280 g will roll smoothly along a loop-the-loop track when released from rest along the straight...
  33. J

    MATLAB MATLAB: Program Unknown # of 'for' Loops w/ i1,i2,iN Variables Smartly

    Hi :) I need to program several nested 'for' loops which differs only in index of their variables inside. So I need to convert this: for i1 = 1000:-d:0 for i2 = (1000-(d*i1):-d:0 ... for in = (1000-(d*in-1):-d:0 some function containing all index variables like: b=(i1*A( :,2), i2*A( :,3), ...
  34. I

    C/C++ Write C++ Nested Loop Program to Print 0-userNum

    Print numbers 0, 1, 2, ..., userNum as shown, with each number indented by that number of spaces. For each printed line, print the leading spaces, then the number, and then a newline. Hint: Use i and j as loop variables (initialize i and j explicitly). Note: Avoid any other spaces like spaces...
  35. Jawz

    Can Vector Loops Simplify Theo Jansen's Linkage Mechanism Equations?

    I'm studying the work of Theo Jansen and want to derive a set of general equations for motion, velocity and acceleration at each point of his linkage mechanism. I've read a general equation can be derived through the use of vector loops but I am having some trouble as my equations have 10...
  36. I

    C/C++ C++ Infinite Loops: Why Do They Occur?

    why do infinite loops occur? is it just because the condition is always true?
  37. C

    What Would a Constant-G Roller Coaster Loop Look Like?

    I was reading this interesting article on different varieties of roller coaster loops, and I know nothing about calculus or ODEs, but I was wondering what the constant-g loop in section 3.2 would actually look like for some typical initial velocity. Is it conceivably possible for a rider to...
  38. A

    Using GOTO and For Loops in Quick Basic 64-Bit for Windows

    I am working with Quick Basic, 64 Bit for Windows, which is quite good indeed, but i met again the same usual difficulties to use [do ... loop] for efficient loops. So I decided to better use [goto], as anyone else! But I also found very useful the classical for loop. Here are some useful...
  39. gfd43tg

    Loops to create an array (matlab)

    Homework Statement Attached imageHomework Equations The Attempt at a Solution I am basing my code off a template I found in a textbook for using loops to create an array. If I didn't find this example I don't think I would even know where to begin with this. Here is what I came up with so far...
  40. gfd43tg

    Compound interest loops problem (matlab)

    Homework Statement (a) Suppose you decide to invest money in a Certificate of Deposit (CD). Write code that assigns to the variable FinalValue the final value of the CD based on the following variables: Investment: the initial amount of money invested in the CD, Rate: the annual...
  41. gfd43tg

    MATLAB Loop Analysis in MATLAB: What is the Code Doing?

    Hello, I am trying to decipher loop codes and I am having a lot of difficulty doing so Here is an example code A = 0; while A < 1 for k=1:5 A = A+(-1)^k; end A = A+k; end So I thought the while function does something an infinite amount of times. This is what...
  42. T

    Flaw in the integral form of faradays law with large loops

    The situation is as such. you have a magnetic passing through a loop(loop 1)of wire as some time t, say you also have a larger loop of say one light year in radius surrounding loop 1, call this loop 2. at some time t the magnetic field is shut off. when this happens would loop 2 instantaneously...
  43. W

    SQL "Where not exists" (nested loops)

    I'm having a hard time understanding how nested loops work in SQL. Find all the people who likes all the hobbies. select p.name from person p where not exists (select * from (select distinct h.hobby from hobby h) as h1 where not exists (select *...
  44. S

    Off-axis magnetic field between two current-carrying rectangular loops

    Homework Statement Not exactly a homework problem, but the actual working resembles it. Basically it is a standard calculation for the magnetic field between a set of Helmholtz coils, except with a rectangular loop instead of circular ie: two identical rectangular magnetic loops (dimensions...
  45. F

    Force between two current-carrying loops

    Homework Statement Consider two circular, parallel, coaxial loops which are almost in contact. They are separated by 1.20mm, have 13.6cm as radius each. Both loops carry a current of I = 127A but in opposite directions. Find the magnetic force that the top loop exerts on the bottom loop...
  46. 2

    Controlled systems - Closed loops

    1. Homework Statement [/b] http://snag.gy/m9Iq0.jpg Homework Equations The Attempt at a Solution I know that the sensistivity of a closed for at small change is given by the formula S = ∂ Ln T/∂ Ln G And T(s) = G_c(s)G(s)/1 + G_c(s)G(s) But since i don't have any G_c(s), i...
  47. A

    Current loops and electric dipoles

    Hello Physics enthusiasts Imagine an infinitesimal small current loop where the current can run clockwise or counterclockwise at frequency v. I am trying to find a linear combination of the two(current loops) which creates the same electric field pattern (far from the dipole) as a very small...
  48. M

    Determining the loops in a mechanism

    how can we determine the loops in this mechanism.
  49. J

    Integral symbol for closed loops over functions?

    I find it sometimes confusing dealing with integrals of multi-valued functions in distinguishing a closed integration path, and an integration path which forms a closed loop over the function. They can of course be quite different. For example: $$\oint f(z)dz.$$ Now, is the integration to...
  50. J

    Phase Locked Loops: Coherent vs Non-Coherent Detection, PLL & 2*pi Rotation

    what is difference between coherent and non-coherent detection? and what is a PLL? secondly what is meant by 2*pi phase rotation? is it same as 2*pi phase shift? thanks in advance
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