Loops Definition and 275 Threads

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?

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...

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...

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

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...

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...

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...

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...

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...

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...

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...

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?

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 >=...

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.

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...

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...

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...

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...

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...

**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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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

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...

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), ...

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...

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...

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

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...

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...

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...

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...

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...

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...

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 *...

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...

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...

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...

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...

how can we determine the loops in this mechanism.

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...

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