Lines Definition and 1000 Threads

Homework Statement Given l→1=(6,−1,0)+t(3,1,−4) and l→2=(4,0,5)+s(−1,1,5), find the intersection of l→1 and l→2 . Homework EquationsThe Attempt at a Solution I'm fairly certain I did this correctly, but I just thought I'd double check to make sure I have a good understanding.

The hyperboloid with equation: ## z^2=x^2+y^2-1 ##, embedded in standard 3-D Minkowski space ( +, +, - ) so that ## z^2 ## is negative, has positive Gaussian curvature equal to 1 ( as found directly from its metric: ## ds^2 = \sqrt{ -dτ^2+(Coshτ)^2 dθ^2 } ## induced from the ambient Minkowski...

The only thing I wish to take from this graph is the intersect of the two lines of best fit. How can I get the uncertainty in this point? While the points appear to have the same uncertainties, they actually each have their own distinct % uncertainty. Would the maximum uncertainty in the X...

*This is a question in an assignment that i have to submit. 1. Homework Statement Two imaginary spherical surfaces of radius (R) and (2R) respectively surround a positive point charge (Q) located at the center of the concentric spheres. What is the number of electric field lines (N2) going...

Homework Statement Determine the equations of the tangent lines to the graph of f(x)=3x(5x^2+1) that are parallel to the line y=8x+9Homework Equations y=m(x-x_1 )+y_1 The Attempt at a Solution 11.f(x)=3x(5x^2+1) The slope of the tangent line y=8x+9 f^' (x)=3(5x^2+1)+3x(10x) f^'...

I'm reading Eisberg's Modern Physics and in it, in the atomic spectra chapter, he says: "We have been discussing the emission spectrum of an atom. A closely related property is the absorption spectrum. This may be measured with apparatus similar to that shown in figure (5-1) except that a...

I am not sure that this is the right rubric for this question, as it is historical, but as it is part of the history of Model Theory, I am putting it here. I will not be offended if the moderators decide that it doesn't belong here. In https://arxiv.org/pdf/1008.2667.pdf, the author states...

Where do the static electric field lines appear to originate from a charged black hole, non rotating, Reissner–Nordström metric? I've had a number of qualified physicists say they appear to come from the center of the black hole, but people on these forums have said that doesn't make sense...

Homework Statement Q1: A power plant produces energy at a voltage of Vi = 18667 V. Before being sent along long distance power lines this electricity is sent through a transformer with 143 turns in the primary coil and 8971 turns in the secondary coil. Voltage is calculated to be...

Homework Statement Two charges 2q and -q are located at x = 0 and x = a respectively. There are field lines extending from the positive charge and lines going inwards to the negative charge. Some of these lines go from the positive charge to the negative, but some go off to infinity from the...

Let L1 be the line passing through the point P1=(−2,−11,9) with direction vector d2=[0,2,−2]T, and let L2 be the line passing through the point P2=(−2,−1,11) with direction vector d2=[−1,0,−1]T Find the shortest distance d between these two lines, and find a point Q1 on L1 and a point Q2 on L2...

Is it possible to direct or confine field lines to be shaped like a laser? I know there are magnets such as neodymium cones that direct field lines through the tip but they don't seem to have the amount of pull as I'm looking for. If there isn't, is there anyway to amplify the power? Maybe align...

Im reading that very hot stars and very cool stars have weak hydrogen lines. With that being said, how do we know that these very hot stars contain high quantity of hydrogen if we can't see it in the spectra?

Hi, this error appears ubiquitously in my document, what does it mean and how can I rectify it? Thanks!

Homework Statement I want to read only specific lines from a file using fortran code. Homework Equations Fortran code The Attempt at a Solution I have a dummy.txt file wrote 7 5 6 4 5 6 9 10 14 19 I want read only values between lines 5 to lines10. But when I use print statement, the value...

I need to draw electric field lines of sphere in uniform electric field with LaTeX/TikZ. Can anyone show me equation of field lines in polar coordinates?

The capacitance formula for equal line is as follows. : * my question : I want to know the capacitance formula for unequal lines and its solving process . Thanks in advance for any hint.

Hi, how do I split up this horrible equation into several lines? given in latex code: \Psi_2=...

What is the difference between the Magnetic Field Lines of the Dipole and Circular Current Carrying Wire at the centre?

I would simply like to know: Given a lossless transmission line with a certain characteristic impedance Z terminated in a load L. How can I go about computing the fraction of the time average incident power arriving that is dissipated in the load? Is this possible without knowing the voltage or...

I have read a few parts in various papers where they refer to tiltered vortex lines in superconductor vortexes, however it is not clear what these lines really mean physically. Can anyone suggest a source or a description to this? Thanks

This might not be the usual kind of question posted here, but I am trying to solve a geocaching puzzle. The puzzle is called "An Irrational Location", and the only information provided is more or less the following: ~~~~~ No rational person should attempt to visit the posted coordinates Cache...

My physics teacher said that the northern lights are the product of charged particles coming from the sun and interactign with our atmosphere. I believe he said that these are deflected by Earth's magnetic field and directed towards the North and South poles. When I look at pictures on this...

Homework Statement Two particles A and B each carry a charge Q and are separated by a fixed distance D. A particle c with charge q and mass m is kept at the midpoint of A and B. If C is displaced perpendicular to AB by a distance x where x<<<D, find the time period of the oscillation of the...

On older GM cars, the brake lines are 3/16" from the front port of the master cylinder, splitting into two 3/16" for each front wheel, and 1/4" from the rear port of the master cylinder, splitting into two 3/16" for each rear wheel. This is the case for drum/drum or disc/drum configurations...

Homework Statement "Two very long uniform lines of charge are parallel and are separated by ##x=\frac{3}{10}m##. Each line of charge has charge per unit length ##\lambda = 5.2_{10^{-6}}\frac{C}{m}##. What magnitude of force does one line of charge exert on a ##y=\frac{1}{20} m## section of the...

Homework Statement The maximum no of spectral lines for a single atom during it's electron's transition is given by [∆n(∆n+1)]/2 . But I don't seem to arrive at the answer when a group of atoms are present . The question was - What is the maximum number of spectral lines possible for Balmer...

Is there any difference between the field lines you draw when one mass approached another mass and when two electrons approach one another? If there is no difference, does this mean field lines can't be used to predict the forces both particles feel?

Has anyone got a good link to a guide to UK power lines? I hate looking up and not knowing what's there. For example, my house has several poles leading to it, strung with one live 240V and one neutral, the latter being tapped to Earth at each pole. What if there are two lines, strung...

Homework Statement Homework Equations N/A The Attempt at a Solution Im not sure if I've done this right because it seems too little for 6 marks. I have arrows coming from the north to the south end for the magnet's magnetic field. I have arrows going counter clockwise around the conductor...

1. The problem statement "If charges are free to move, the field lines will straighten and shorten as the charges move together" 2. Questions in relation to statement Are there any cases in which charges aren't free to move between two charged objects such as between conductors or insulators...

Hi, I'm reading the textbook and there is my image. http://imgur.com/a/9BqHm It says "The field vector E bar is tangent to the electric field line at each point". I might want to ask what "tangent" means in this sentence? Sorry to ask that stupid question.

Hey! :o Let $ax+by+c=0$ and $a'x+b'y+c'=0$ be the equations of two parallel lines $g$ and $g'$ in Hesse normal form. I want to calculate the between the two lines. We have to pick a point of the line $g'$ and calculate the distance of that point and the line $g$, or not? (Wondering) How can...

I was going through MIT opencourseware https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-013-electromagnetics-and-applications-spring-2009/readings/MIT6_013S09_chap07.pdf and I didnt understand exactly why in equation 7.1.37 and 7.1.38 in page 192 the divergence of...

As a result of working on https://www.physicsforums.com/threads/area-of-hexagon-geometry-challenge.914759, this question occurred to me: Divide each side of a triangle into n equal lengths. Connect the ends of each length to the opposite vertex with straight lines, thereby forming 3n...

Would somebody explain how to combine two lines into one? I think this is a CAD question. It's from Ansys's DesignModeler, Geometry Engine. I would like to make lines 1 which is at the right hand side like 2 which is left hand side of the L-shape object. In that program there are options like...

Say a power station transmits 1008 MWh of power per year to a facility however they only receive 900 MWh say the transmission line is 15 km long how would you calculate average power loss per km, now I know that theoretically it will just be 7.2 MWh per km but what calculations would you make to...

Hi, N00b question :-) I have read articles about redshift and blueshift and have a good idea about them. What I would like to know is how you decide if something is "unshifted" - what is the definition of this? is there a standardized way of defining/mapping an element's unshifted spectral...

Here is an explanation about drawing the graphs of linear lines which, I think, incorrect. So would you check it? "If graph, such as y=7x, goes through the origin, it has only one intercept, and other points will be needed for graphing." I think other points will not be needed because lines...

When looking at a night light with almost closed eyes, I notice that the light becomes a vertical line. When tilting my head 90 degrees, the line becomes horizontal. Can this be explained by Heisenberg's Uncertainty principle? This question has been asked in another thread : "Squinting at...

Homework Statement This picture: http://i.imgur.com/n015WjU.png It's drawn with exactly the amount of information from the worksheet. Specifically, the two secants meet at a point, with an angle of 28 degrees between them. Both secants partition off an arc of 120 degrees. The goal is to...

Homework Statement Hi guys, I hope you can help me with this problem, because I do not have any idea and I could not find anything that could help me, thank you in advance! Draw the electric field lines due to a punctual charge Q immersed in a dielectric medium with constant K1. Q is separated...

I have a question which puzzled me when I was reading up about auroras. When talking about the interaction of the solar wind and the Earth's magnetic field, the book said that "particles are accelerated along magnetic field lines towards the earth" That didn’t sound quite right, as I was taught...

Homework Statement [/B] Can someone help me solving this problem ? A lossless coaxial cable is used in a data network. it has an er =3 (relative permittivity) It is driven by a pulse source with internal impedance of 10 ohm, 1 V amplitude, square wave with duration of both positive and...

In a triangle ABC: A(-2,7) and C(7,-5). The length of the altitude of AC is 5, and the length of the altitude of BC is the square root of 45. I wish to find the vertex B, given that it is below the line AC. I need your help, I have no idea how to approach this. Thank you in advance. I have...

Homework Statement can someone help me solving this problem ? A coaxial cable is driven by a pulse source with internal impedance of 1kohms, 1 V amplitude, square wave with duration of both positive and negative pulse is 800 ns, with negligible rise- and fall-time. The load impedance is 10...

Homework Statement For which m and n the lines are concurrent? ##r: \begin{cases} x & - & y & = & 1 \\ nx & - & y & - & 2z & + & m & + & 1 & = & 0\end{cases}## ##s: \begin{cases} x & - & nz & + & m & + & n & = & 0 \\ x & + & y & - & 2nz & + & 11 & = & 0 \end{cases}## Solving r gives me...

Hi PF! Can someone help me understand how to draw lines of constant pressure in an inviscid flow field, say flow around a cylinder. I am having trouble understanding how to draw these. Any help is greatly appreciated! I ask this question because I am preparing for the Q exam for PhD and one of...

If you take an outdoor photo through a bandpass filter that only let's light through in a Fraunhofer line would it be completely dark, like night? Or would it have some daytime illumination?

Here's a fun way to do multiplication graphically that originated in Japan: