Lines Definition and 1000 Threads

Homework Statement [/B] Find points P,Q which are closest possible with P lying on the line x=8+1t y=8+1t z=7−3t and Q lying on the line x=231−6t y=−10−17t z=71−13t 3. Attempt at solution Hi, I am at loss as to how to do this. I know that from the equations I can get point (8,8,7) and...

This is a bit vague, but I remember reading that during stuff like coronal ejections, magnetic field lines "reconnect". Now, does that not suppose "loose" magnet lines in the process? Which to my understanding do not exist?

spectral lines As far as I understand spectral lines represent allowed transitions between energy levels in a particular atom. And that the number of energy levels should increase with increase of a number of electrons, due to electron-electron and spin-angular-momentum couplings. Right...

Homework Statement How are the two lines r = i + 2j + t(i - k), and r = k + s(-i + k) parallel? t,s∈ℝ Homework Equations parametric vector equation of a line r-r_0=tv The Attempt at a Solution Tried to find the conditions for lines to be parallel in ℝ^3.

Homework Statement You want to get an idea of the magnitude of magnetic fields produced by overhead power lines. You estimate that the two wires run about 30 m above the ground and about 2.9 m apart. A call to the local power company provides the information that the lines operate at 10 kV...

I have looked in vain on the web for pictures of magnetic field lines for multiple linked current loops. I would be happy just to see a picture of the field lines for a simple Hopf link but somewhere there must be pictures for the Borromean rings and other more complex links - and also braids...

Okay I'm having a little trouble understanding a section of this proof about the product of the gradients of perpendicular lines given in my textbook. I'm going to type the proof out but there will be a link at the bottom to an online version of the textbook so you can see the accompanying...

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...

From textbook: "In much of the world (Europe, Australia, Asia) the rms voltage is 240 V, so the peak voltage is 340 V. The line voltage can vary, depending on the total load; the frequency of 60 Hz or 50 Hz, however, remains extremely steady" Why is it so important to keep it steady? what...

i want to know the behavior of voltage in 11 KV underground and OH distribution line at different load conditions i.e. no load-full load ...

Hey everyone, This is quite a simple question, I think I'm just getting confused. 1. Homework Statement Given Data: Merlin: Resistance: 2 Ω / km, Maximum Current: 519 Pelican: Resistance: 1.5Ω/km, Maximum Current: 646 Penguin: Resistance: 4 Ω/km, Maximum Current: 357 Sparrow: Resistance...

Homework Statement The diagram above shows a single slit with lines marking the direction to a point P in the diffraction pattern. Two wavelets at x and y pass through the edges of the slit as shown. The possible value for path difference, py-px, that places P at the second nodal line next to...

The average annual exchange rate in Canada for the US Dollar from 1998-2007 is shown in the following table. Draw a scatter plot, without using graphing technology Year Exchange Rate 1998 .67 1999 .67 2000...

Hi! I have two questions regarding spectral lines, in the optical wavelengths. Every line has a width. One reason is the uncertinity in energy of the atomic states according to Heisenberg uncertinity relation. But this is just a very small part of the width, I think. Are there other causes to...

Hi I am currently trying to find the water absorption lines by using a Michelson interferometer, as a detector I am using an ocean spectrometer. The data obtained is thus the spectrum's "received" by the spectrometer. Am I right to assume that in order to find the absorption peak/peaks I should...

I can't seem to find an answer to this quick question: which part of the star causes the observed spectral lines? As I understand, the photosphere is the deepest visible layer of the star, and then light passes through the chromosphere and the corona. I would think that both the chromosphere and...

Homework Statement [/B] Find equations of both lines through the point (2,-3) that are tangent to the parabola y=x2+x. Homework Equations Slope formula: (Y2-Y1)/(X2-X1) = M The Attempt at a Solution Here's what I think I need to do. First I think I need to find the derivative of the...

Hey! :o Using vector methods show that the distance between two non parallel lines $l_1$ and $l_2$ is given by $$d=\frac{|(\overrightarrow{v}_1 - \overrightarrow{v}_2) \cdot (\overrightarrow{ a}_1 \times \overrightarrow{a}_2)|}{||\overrightarrow{a}_1 \times \overrightarrow{a}_2||}$$ where...

Homework Statement I'm having trouble understanding how you are supposed to decide which nodal and antinodal line numbers are supposed to be attached to the corresponding line. Homework Equations https://roncalliphysics.wikispaces.com/Year+13+Double+Slit+Interference I've read this and...

Random question about waves like this as they pertain to |a-b| = λ(n - ½). Is the middle nodal line = 1, since it is 2 over, would Pn = 3 in this image. If that is not right, the middle nodal line must = 0, and therefore Pn = 2. I don't think this is true because I remember reading the...

Homework Statement "Let L1 be the line having parametric equations : x = 2 - s, y = -1 + 2s, z = 1+s and L2 be the line: x = 1 +t, y = 2+ t, z =2t . a. Do the lines intersect? If so, find the point of intersection. b. Find the point P on the graph of L1 that is closest to the graph of L2...

Are magnetic field lines actually lines? To me, they are just a way to pictorially represent the magnetic field, and there are no lines. BUT, whenever you do the experiment with magnetic filings on a piece of paper, they align in actual lines. HELP!

Hello! :o I have to find the line that passes through $(3, 1, -2)$ and intersects under right angle the line $x=-1+t, y=-2+t, z=-1+t$. (HINT: If $(x_0, y_0, z_0)$ the intersection point, find the coordinates.) I have done the following: The line that passes through $(3, 1, -2)$ is of the...

Homework Statement Find the equation for the plane containing the lines: x-y+2z=4 2x+y+3z=6 and the point: (1,-2,4) Homework Equations A(x-xi)+B(y-yi)+C(z-zi)=0 The Attempt at a Solution First I wrote down the vectors from the line equations, V1=<1,-1,2> V2=<2,1,3> After this I did the cross...

Hi all. I did search in internet but couldn't find the specific answer for my specific problem.I need to run a program with a datafile in 3000 time step and the output will 1.dat to 3000.dat, which is every single data output size 200Mb. To safe the storage, I would like to write only every...

Homework Statement Air is flowing with a speed v in the direction (-1, -1, 1,) calculate the volume of air flowing through the loop consisting of straight lines joining (in order i presume) (1,1,0) (1,0,0) (0,0,0) (0,1,1) (1,1,0) Homework EquationsThe Attempt at a Solution I assume you have to...

Consider the Lines Below: r = <2, 3, 0> + t<3, -3, 1> r = <5, 0, 1> + s<-3, 3, 0> A.) Find the point at which the given lines intersect. B.) Find an equation of the plane that contains these lines.Homework Equations [/B] The vector equation of a line is given by r = r0 - tv The equation of...

In the Matlab program below U=[210; 100; 150] ky= linspace(-.2,.2); qx=sqrt(((150-U)/.2)^2-ky.^2) I want to have qx as a matrix in which each row is corresponding to one value of U: the first row corresponds to 210, the second to 100 and ... How should I do this? (I want to avoid the "for...

To make a very long story short, in a group theory problem I am working on, I need to prove this: ##A \lhd B \Rightarrow A'\neq A##, where ##A## and ##B## are finite and ##A'## is called the commutator subgroup: ##\begin{align} A' :&= [A, A] \\ &= \langle [x, y] \mid x, y \in A \rangle \\ &=...

A friend asked me to help him with this; probably simple, but I seem to be missing something obvious: For what values of ##b## is the line ##y=10x## tangent to the curve ##C(x)=e^{bx}##? Seems we need ##C'(x)=be^{bx} =10 ## for some pair ##(b,x)##. But this is where it seems hairy: how do we...

Is it true that electric lines of force never cross?If yes,then Why?What Physics say about it?

Homework Statement Hi, An equation of the form Ax + By + C = 0 is a standard equation of a line in 2D. An equation of the form Ax + By + Cz + D = 0 is an equation of a plane. Is it possible to: Describe a plane in space, written in standard form, such that one variable is missing from the...

Homework Statement Hi, I've been unable to find a relevant thread for a question that I've been stuck on for a couple of days now. Here it is; One of the electromagnetic emission lines for a hydrogen atom has wavelength 389nm. Assiming that this is a line from one of the Lyman (nf =1 )...

Hi I was working on delay-lines and I wanted to know if a pulse is delayed by 10 pulse lengths through a delay-lines than what is the corresponding storage bit for that delay line. Thanks

Hi all... practical applications here... I have questions about RV travel, or travel trailer/ 5th wheel and electrical safety. With taller RV's or trailers, there is a danger of striking low power lines in the more rural areas. My question is specifically and only about what happens *when*...

Say if I magnetize a hollow cylindrical ring magnet by placing a staight current carrying wire along its axis. It will be magnetized with magnetic field lines running inside the cylinder clockwise or anticlockwise! So there will be no magnetic field lines outside the iron body? If I have a...

Hello Forum, It is well known that the electrical power dissipated (in the form of heat) by a resistor of resistance R connected to a battery of voltage V is: P_diss = (V^2)/ R or equivalently P= (I^2)*(R) Clearly the smaller the resistance R, the more the dissipated power because R is at...

Homework Statement How many nodal lines are created by two point sources emitting at the same wavelength that are separated by a distance equal to 2.5 lamda? Homework Equations My textbook says, "If two coherent sources located a distance d apart emit identical waves of wavelength lamda, then...

Hey guys - I've been using this website to study transmission lines. (great study aid - posting for others to use. Great for smith charts) However, I've noticed this graph they have for load matching: I'm having trouble finding or understanding a relationship for reflection vs frequency...

Hi all, I am new to here and also new to EBL. I believe Electron Beam Lithography has a limit of sub-10 nms. Today when I draw a CAD file, I saw other than area, we can also draw line and dots. That doesn't make sense since there is a limitation on feature size and line width has to be at least...

Homework Statement A conductive ball of diameter 0.4 [m] is charged equally with a concentration of \sigma=8 [micro-coulon/m^2]. What's the total number of electric field power lines, N, that extrude from the ball Homework Equations The electric field near a conductor is like in a capacitor...

Homework Statement Strong emission lines from calcium were observed at ##422.7nm##, ##610.3nm##, ##612.3nm##, ##616.3nm##, ##1034.9nm##, from transitions between ##4s^2##, ##4s5s## and ##4s4p##. The transition of ##422.7nm## was also observed at absorption. The singlet-triplet splitting of...

Suppose there is an uniform magnetic field along z-direction. Now someone turns off the field. Then there will be an induced electric field. Can anybody draw this induced electric field lines? I know the electric field will curl around. But where will be the centre of that curl. Do the electric...

The Question Winning Lines Tic-tac-toe is a game played by two players o and x. A player wins when he/she succeeds in placing three respective marks in a horizontal, vertical or diagonal row. Given a 3-by-3 tic-tac-toe board, a winning line is a line (row, column or diagonal) that is not...

1. Write down the equation for the line in 3D through the point a=(1,2,4), parallel to the line r=(1,-5,0)+λ(1,2,2). Then, find the distance between these lines. 2. 3. Lets say, b= (1,2,2). b is parallel to given line, so it must also be parallel to the new line. My guess is that the equation...

Good day, anyone can point out to me how kikuchi bands are formed? And I mean bands, not lines. I finally managed to understand (I think) kikuchi lines: bragg diffraction is decreased in the incident direction (defecit=darker line) and enhanced in the "bragg" direction (excess=brighter line)...

Homework Statement kindly refer to the yellow highlighted part, why is but not ? Homework EquationsThe Attempt at a Solution

Hi, I need a little help understanding transitional lines on parallel and non parallel lines. Can you please help me? I am trying to refresh my memory! Thank you!

Hello, I would like to know, how to calculate the number of grid lines( or loops) in a strain gauge. I'm trying to calculate the output form the each grid lines. Thanks in advance

Hi guys, new here. We all know the famous "Bragg Law" and the attached schematic drawing that goes along with it of a couple of planes with a distance `d` between them. Then, a DP occurs cause of constructive interference and destructive interference which happens due to planes deep in the...