Loop Definition and 1000 Threads

Homework Statement A roller coaster at the nearby amusement park Physics Hill, has a large circular loop where cars travel at the top of the loop at 25.0 m/s causing the riders to enjoy an acceleration of 3g. Assuming the height of this loop is the same as the diameter, how high is the loop...

Hey,for following code the 3rd loops i need to have 2 variables m and q .Could anyone help? for t=1:maxiterations toterror=0; for j=1:numfeature totslope=0; for i=1:m&&q=1:numfeature z=0; for jj=1:numfeature...

Homework Statement The diagram shows a rigid conducting wire loop connected to a 6.0 V battery through a 6.0 V, 3.0 W lamp. The circuit is standing on a top-pan balance. A uniform horizontal magnetic field of strength 50 mT acts at right angles to the straight top part of the conducting wire in...

Two questions I had: 1. How is the force of friction of the tires pointed inwards to cause centripetal acceleration? If the tire is rotated when trying to turn, the car is still traveling with a velocity perpendicular to the circle and force of friction would still be counteracting the...

Homework Statement https://s10.postimg.org/lb6n94ua1/20161007_190700.jpg Homework Equations V=IR The Attempt at a Solution So far I haven't had any problems finding the Req. However, I am having trouble with the VIR chart. Can anyone confirm whether or not I did it correctly. My thought...

Hi all, I fairly basic question about spin foam models in loop quantum gravity. I just want to verify that spin foams represent effectively represent all of spacetime (in a quantum form), and that the idea is that general relativity can be obtained in the classical limit? Not sure if that's...

Homework Statement This is a question regarding Problem 7.11 in Griffiths Electromagnetism book, which considers a falling square loop of aluminum through a uniform magnetic field pointing into the page with only part of the loop in the field at t=0 (see picture below). To solve this...

Homework Statement A compressed spring is used to propel a ball-bearing along a track which contains a circular loop of radius 0.10 m in a vertical plane. The spring obeys Hooke's law and requires a force of 0.20 N to compress it to 1.00 mm. (a) The spring is compressed by 30 mm. Calculate...

Hello, Short description: In my country's physics olympics, if a loop of wire is moved in a changing magnetic field, the time derivative of the area (while calculating emf with lenz law) is the velocity of the loop (as if we're taking the time derivative of the AREA SWEPT). This has became an...

Homework Statement The actual question was to somehow derive the expression for a magnetic field at the center of a current carrying loop. Homework Equations The Biot-Savart's law equation dB = (mu/4π)*(i dl x r)/r^3 (I'm not actually good at typing in the equations, so please just forgive...

Homework Statement The figure below shows a closed loop of wire that consists of a pair of equal semicircles, of radius 7.0 cm, lying in mutually perpendicular planes. The loop was formed by folding a flat circular loop along a diameter until the two halves became perpendicular to each other...

Hi all, Following up on another post - for a layman, can someone describe the status of virtual particles in Loop Quantum Gravity models? Since LQG avoid UV divergences, and has a different structure from field-based theories, are virtual particles still talked about? (in the context of closed...

Aloha guys, I am just having trouble getting MatLab to output only the last variable of my "for loop." If anyone can help all I am looking for is an example of notation. p.s. I have done this before just not in a while and will continue to look through my old scripts and functions. just not in...

Homework Statement Homework Equations Loob Analysis V=IR The Attempt at a Solution So I think I have the right equation here, but I am a bit confused on some parts. I am not too sure why i2=i1-ix. The way my professor explains it doesn't make much sense. Also (TYPO) in the second...

can Loop Quntuam gravity be merged with Asymptotic safety scenario in gravity into a single theory of QG, one that has both concepts ? i.e if you start with Loop Quntuam gravity in 4D, can you show that it is also implies Asymptotic safety scenario in gravity in 4D? are there any papers...

I'm asking the above question as I imagined a current loop made out of a curving wire that cannot fit into a flat plane. Where does the direction of μ point then? Also, is there only one μ value for any current loop, independent of the chosen axis of tilting? Or can a current loop have...

I was wondering why Quantum loop theory is still being followed FAIK it does not predict any thing yet, the same for string theory which seems to have lost its predictability, if these theories fail being tested where will we be It seems to me like super symmetry is the theory that every one...

Here is my code: while a ~= 3 || b <= 1; a = a - 1; (other expressions); end; For this code, the 'while' loop should stop when 'a' reaches 3, however it does not, even though 'a' starts with a higher value than 3. The 'other expressions' part are calculations that manipulate 'b', the only...

Homework Statement This is for my ap physics summer work and is giving me some trouble and could use any help A small block, with a mass of 250 g, starts from restart the top of the apparatus shown above. It then slides without friction down the incline, around the loop then onto the final...

Homework Statement for teh circled part , why there's again =='y' ? i didnt see the variable 'y' anywhere other than the circled part ...What does it mean ? Homework EquationsThe Attempt at a Solution Is the code wrong ?

I'm reading these lecture notes but there is something I don't understand. In page 15, it starts to consider vacuum diagrams of various orders and tries to associated a factor to them according to the rule: ## diagram \sim (\frac \lambda N)^p(\frac N \lambda)^v N^l=\lambda^{p-v} N^{l+v-p}##...

So I came across the following image (from Wikipedia) where the electric and magnetic field lines are depicted for a dipole antenna. From the field lines, it is possible to determine the direction of the poynting vector, using the right-hand rule. If all possible combinations of poynting...

Hi all, This might be a simple question but I cannot seem to find any solution online I'm currently building a MatLab code for my project which involves in the ageing of certain artefacts and paintings, I've got most of it built but can't solve the simplest of problems of the start of the...

Homework Statement An infinitely long line of current $I_1=6[A]$ is following along the positive z-axis in the direction of +$\hat{a_z}$. Another current is following a triangular loop counter clockwise from the points A(0,2,2), B(0,6,2) and C(0,6,6). Homework Equations To start I applied...

Homework Statement A circular single loop of wire with a diameter of 20.0 cm lies in the plane of the paper in a region of space that contains a 1.75 T magnetic field pointing out of the paper. a) Determine the magnetic flux through this loop. b) If the diameter of the loop changes from 20.0...

Hi, I have a function defined by: F[x_,y_,z_]:=3 x+y-2Y[z] where Y[z_]:=3/z I'd like to run Do loop to calculate the value of this function for specific regions of x,y,z. I can use: Do[F[x,y,z],{x,1,2,1},{y,-2,-1,1},{z,3,5,1}], But I have two questions here: First: How to save the output...

Imagine a right circular cone with smooth surface. The cone is stated such that its axis is parallel to the standard gravitational field g. And you have a piece a thin homogeneous chain. Then you connect the tips of the chain to obtain a loop. You put this loop on the cone: It is clear...

Some say that AC should form a closed loop circuit for electricity utilization but is there really an loop from the Power station(hot wire) to the Ground(neutral) and then from Ground to power station so that it forms a loop?

Homework Statement An electric charge Q is uniformly distributed along a thin circular wire situated in the z = 0 plane at x2 + y2 = R2 . Determine the electrostatic potential at the point (0, 0, D). Homework EquationsThe Attempt at a Solution I figured the only components that mattered would...

If I have a some a wire and I took part of it and created a circle. If I want to calculate the strength of the magnetic field at the center of it. I should just use the magnetic field equation for the circular loop, shouldn't I? ## B = \frac{U_o N I}{2R} ## and I shouldn't care about the...

Write a function PrintShampooInstructions(), with int parameter numCycles, and void return type. If numCycles is less than 1, print "Too few.". If more than 4, print "Too many.". Else, print "N: Lather and rinse." numCycles times, where N is the cycle number, followed by "Done.". End with a...

A quick question, I remember my professor said to use the center of mass for solving the classic loop de loop problem. For example, he wanted us to use the distance from the surface of the loop to the center of the object (instead of just from the loop to the surface of the block) for the height...

Homework Statement A uniform magnetic field is perpendicular to the plane of a circular loop of diameter 10 cm formed from wire of diameter 2.5 mm and resistivity 8.5×10-8 Ω·m. At what rate must the magnitude of the magnetic field change to induce a 10 A current in the loop? Homework Equations...

When deriving the magnetic field strength due to a circular loop at some distance away from it's center (using Biot-Savart's law), why is the angle between ds and r 90 degrees? This is a youtube video with the derivation, see 5:55

Homework Statement A long straight wire has a line charge, λ that varies in time according to: λ = λ0e(-βt). A square loop of dimension, a, is adjacent to the wire (at a distance a away from the wire). Calculate expressions for the displacement current at the center of the wire loop and the...

Homework Statement The figure shows a cross section across a diameter of a long cylindrical conductor of radius a = 2.92 cm carrying uniform current 151 A. What is the magnitude of the current's magnetic field at the center of the conductor? Homework Equations Biot-Savart's Law The Attempt...

Homework Statement A picture of a related problem is attached below. My problem is the same, except that v is toward the wire, not away from it. I, r, v, b and a are given. "Find the emf about the loop without assuming that B changes at any point" My problem is that this question isn't...

It is well known that a circular loop of steady current does not radiate, even though each individual charge is undergoing centripetal acceleration. How about a loop of steady current that is shaped in a square? Does this structure radiate?

Hi, so, I got help from this homework problem by posting it on chegg, but I want clarification. A circular loop of wire of radius 12.0 cm is placed in a magnetic field directed perpendicular to the plane of the loop and into the page. The field is decreasing at a constant rate of 0.050 T per...

A square loop of wire in the x-y plane, centred on the origin, is made up of four straight segments, each of length 2d=10cm. A current I =10A flows in the wire in the direction shown. Find the magnetic field at z=d on the z-axis. (See "Diagram" for the diagram of the problem) Here is the...

I originally posted this to the advanced homework -section, but maybe this isn't advanced enough to warrant being posted there :oops:. If a mod sees this, feel free to delete the original on the other forum. I'd do it myself, but I can't. 1. Homework Statement Calculate the mutual inductance for...

Homework Statement Rigid contour of an isosceles triangle and a long line cable lie in a plane and are located in vacuum . Determine the intensity of the magnetic force F acting on the loop. Current I = 100 A. free upload image Correct answer: F = 386 mN. I am getting 2 mN. Notice that I...

Homework Statement I'm working on my research project at uni, running a gas-liquid flow loop for horizontal stratified flow exhibiting wave propagation. The equipment I have however is setup to investigate vertical flow primarily and the flow meters are located on the vertical sections. I need...

Homework Statement I have attached a picture that details the problem. This is my practice test and I have no clue what I am doing wrong. Essentially a loop of wire is moving in constant velocity into a magnetic field. The magnetic field lines are pointing into the page. The problem is...

Homework Statement Homework Equations i1+i2-i3=0 50i1+75i3=1 100i2-75i3=1 The Attempt at a Solution matrix A=1 1 -1 0 100 -75[/B] 50 0 75 matrix B= 0 1 1 i1= -6ma i2= 23ma i3= 17ma My instructor gets i1= 6ma...

Homework Statement [/B] I need to work out the open loop transfer function of the above. I've drawn it on word so it's not great; the + and - represent a summing junction. Homework Equations Everywhere I read, I find a different definition of open loop transfer function. I see G*H is an oft...

This is a continuation of a previous thread in which I was informed my TA was mistaken on an aspect of magnetism. This thread is just to verify another problem within the homework is correct. Other threads will be posted to continue. 1. Homework Statement A) What is the magnetic flux...

Homework Statement A square of wire with side length 1.4 m rotates about an axis through one corner that is perpendicular to the plane of the square with an angular speed of 3 rev/s. There is a uniform magnetic field of 1.2 T perpendicular to the square. Calculate the EMF induced in the...

How is loop quantum gravity related to the principle of relativity, in particular to the diffeomorphism invariance of general relativity?

I am having problems with printing out each elements of the array using a for loop It's suppose to look like this: Enter non-negative numbers (ints) terminated by -99 1 2 3 4 5 6 -99 Original list (6 values): 1, 2, 3, 4, 5, 6. the code's output looks like: Enter non-negative numbers (ints)...