Lines Definition and 1000 Threads

Homework Statement The points P (2,-1) and Q (3,-4) lie on the parabola y = -x2+2x-1 a) Find the slope of the secant line PQ. b) Find the slope of the tangent line to the parabola to the parabola at P. c) Find the equation of the tangent line at P. Homework EquationsThe Attempt at a Solution I...

Homework Statement From the derivation of v(x,t) and i(x,t) I am stuck on how the inverse Fourier transform of e^(-jwx/u) was calculated. I am trying to understand how the PDE was fully solved here: http://fourier.eng.hmc.edu/e84/lectures/transmission_line/node1.htmlHomework Equations Not...

Hi guys, I am working on an computer vision project. the project uses two cameras to triangulate an object in front of the cameras. Homework Statement Express the object's location in 3d coordinates relative to the cameras. Homework Equations From the software i can get two line equations...

In graphs c, d, e, and f below the red and blue pair of lines appear to be rotating about the horizontal axis. I'm curious how these graphs appear to others. When the lines are at the top do they appear to move towards or away from you? Thanks for playing! To me the top parts at first appeared...

Hi, I have an interesting problem. I have three GPS coordinates, creating two lines across the surface of a sphere (assuming the Earth is spherical). I want to be able to create a new line (across the surface of a sphere) with a gradient that is in between the gradient of the two existing...

In Python 3... I have a few lines of code that I want the user to choose how many times it will run. For example: times=int(input()) 'times' will be the number of times the lines of code will run. How do I do it?

In the numericals based on transmission line, the wording is like this-" A transmission line feeds power to a load at 132kV, 0.8 pf lagging and so on." In practice, are pf and current really constant? Doesn't it depend on the load? I mean, every minute someone is switching something on and...

Homework Statement Two infinitely long lines of uniform charge λ lay parallel on the xy plane (0, ±a) What is max E field in the xz plane. No values are given. Symbolic answer is expected. Homework Equations equation for an infinite line of charge E = λ / ( 2 π ε0 r) The Attempt at a...

Homework Statement Hey! I have trouble with an exercise that I need help with. Here it is: The magnetic field lines for the average interplanetary magnetic field (IMF) follow Archimedean spirals. i) Find the heliocentric distance r in Astronomical Units (AU), where a field line has wrapped...

Homework Statement For two coherent sources vibrating in phase separated by 4.5(lambda), what are the numbers of antinodal and nodal lines? Homework Equations No. of nodal lines equals twice the floor function of separation over wavelength. The Attempt at a Solution No. of antinodal lines=...

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?

in the absorption and emissions spectrum of elements, what happens to the light that is not absorb? -ed. in the absortion and emission spectrum of elements, in carbon there is a lot of colored light that carbon does not absorb. Like carbon absorbs blue light, but not all wavelengths of blue...

Hello people, I was wondering, why the absence of certain frequencies in the sun spectrum (fraunhofer lines) is so strong? In all pictures I have seen so far these lines are very dark, so there is nothing reaching us at these frequencies. Why is that? The absorption occurs in the solar...

Hello, I VAGUELY recall reading, some many years ago, a statement to the following... "The Greeks were obsessed with circles. Had they relaxed this obsession, they may have seen the significance of modeling curves with small straight lines, and thereby anticipated the Calculus." Is there any...

Can anyone explain me in simple words what is quescent point and what is shows 2- what is ac and dc load lines what they represents actually and what is difference between ac and dc load lines

Hi, I'm trying to size up a suction line, for a positive displacement gear pump. I'm flowing 3.4 GPM. The oil I'm looking at using is Case IH Hy-tran. It has a SUS # of 208 at 100 degrees F and 47 at 210 degrees F. cSt of 40 at 40 degrees C and 6.3 at 100 degrees C. I have sized up a 7/8"...

Homework Statement https://www.google.se/search?q=f%C3%A4ltlinje&rlz=1C1_____enSE665SE665&espv=2&biw=1366&bih=643&source=lnms&tbm=isch&sa=X&ved=0CAYQ_AUoAWoVChMI9dTNgquLyQIVhJIsCh1NxQZU#tbm=isch&q=physics+field+lines&imgrc=rKecBAfLOMsOoM%3A Why are the field lines on the positive atom pointed...

I'm a computer scientist who was recently given a book about quantum physics. I am confused about something in the book. Imagine shining an x-ray (produced by copper K alpha 1 emission) on an aluminium foil. I understand the basics of photoelectric effect. You shine the x-ray on target aluminium...

Homework Statement The figure shows crossed uniform electric and magnetic fields and, at a certain instant, the velocity vectors of the 10 charged particles listed in the table. (The vectors are not drawn to scale.) The speeds given in the table are either less than or greater than E/B (see...

Homework Statement Hi! I'm not sure the title I gave properly reflects my problem, but I did not know how to describe it in another way: (roughly translated from German) "In three dimensions, we can divide the space in two parts through a plane. In four dimensions, that does not work anymore...

in 3D assume two skew lines L1: x=x°+at, y=y°+bt, z=z°+ct, L2: x=x°°+ds, y=y°°+es, z=z°°+fs. therefore L1, L2 parallel vectors are respectively: v1= <a, b, c>, v2= <d, e, f>. if v1.v2= ad+be+cf= 0 (vectors are perpendicular), are the line L1, L2 considered perpendicular also or beside the dot...

... to visualize relative distances between two points of interest. Do any of the microsoft office applications do this? For example, I would like it to start with an origin of 0 on the left, show the number 5, then show the number 146. I just need a good program for plotting these types of...

Please explain it.

How many nodal lines are created by two point sources emitting at the same wavelength that are separated by a distance equal to 4.5*lambda? I used the equation 2(d/lambda) which in this case equals 9, but I've been told this is incorrect. Where have I gone wrong?

Here's something I've been wondering about: does non-Euclidean modern physics imply that there are no straight lines in our universe? If so, how is this possible? With any circular object or space, one can always draw a straight line through it, right? Thanks.

I've been doing some bedtime reading in Chabay & Sherwood's Matter & Interactions textbook (https://www.amazon.com/gp/product/0470503475/?tag=pfamazon01-20) and have come across some interesting tidbits. Here they are: I've always pictured electrons pushing each other through a wire, kind of...

Hello to all of you. I have the following case to solve. I have three overhead power line towers. The first and the third are with tension insulator strings, and the second is with suspension insulator string. During the design process i noticed that the second tower is located incorrectly and...

Hi, A potential magnetic field has no curl. According to the "curl theorem" or stokes theorem, a vector field with no curl does not close. Yet, Maxwell's equation tell us we shall not have magnetic monopoles, so the loops have to close... ? What am I missing to remove this apparent paradox of a...

Homework Statement Say how coordinate lines of the z plane transform when applied the following transformation ##e^z=\frac{a-w}{a+w}## Homework EquationsThe Attempt at a Solution This is exactly the way the problem is stated. It is a pretty weird transformation in my opinion and I'm guessing...

The electric field emanating from charged particle travels at the speed of light; fine. To pose an unrealistic thought experiment (a more realistic, if more complicated, thought experiment could replace this one, but the unrealistic one gives the idea), if a proton were to suddenly pop into...

in the video above the instructor explains from time 8:22 to 8:55 that how and why electric field lines going out from the surface which do not enclose charge is zero but I don't understand then why not electric field lines going out from the spherical surface ( enclosing charge) is...

I have read that electric field lines of positive source charge end on negative charge and Today I came to know that electric field lines of positive source charge end on infinity,which one is correct?I think electric field lines of positive source charge end on infinity if the positive source...

I have a circle, representing Earth with equator drawn on it. I need to draw longitudinal lines on 15 degree, 30 degree, and 60 degrees distance? I am not sure how and from where to measure these angular distances. Thanks.

In my book following points have been given 1-due to conservative nature of electric field ,the electrostatic field lines will not form any closed loop.I want to ask how forming a loop makes if non conservative? 2-Field lines have tendency to contract in length (longitudinal contraction )like a...

The E and B field lines of a dipole radiating EM waves looks like that (sorry for the poor quality) : What I wonder is how can we see that the amplitude of the fields decrease as 1 / r? When you look as such a picture it actually feels likes the amplitude should rises. The E field gets...

Given a system of two charges (+7q and -q) some of the field lines will terminate at -q while others go on towards infinity. I've read that the portion of the field lines that terminate is given by (1/7), but I have no idea why that is. I am supposed to find the maxium angle of a field line...

Homework Statement Calculate the power (Pso) absorbed from the supply by the transmission line on open circuit. Given parameters are: A1= 0.8698 A2= 0.03542 B1= 47.94Ω B2= 180.8Ω C1= 0S C2= 0.001349S D1= 0.8698 D2= 0.03542 I have calculated Vs and Is earlier in the question Vs= 77325 +...

Ok we know that the electric field(uniform or non uniform) is a conservative field. Imagine three horizontal electric field lines in '+X' direction separated by unequal distances let's say line 1 and 2 is separated by distance 'a' and line 2 and 3 is separted by some distance 'b' such that...

Homework Statement Find an equation of the tangent lines [in point-slope form] to the hyperbola x^2 + y^2 = 16 that pass through the point (2, -2). Homework Equations Point-slope form: y - y_1 = m(x - x_1) Slope: m = \frac {y_1 - y_0} {x_1 - x_0} The Attempt at a Solution First, take the...

Do you use two lines (of regular ruled paper) for a rational function? FOr example, would you use two lines or one for the equation ## f(x) = (x^2-3) / x+2 ## I can see three ways (in general) of writing this. 1) numerator and denominator each get one line 2) num and den are written smaller...

Hi all, Please help. I am stuck with the question below and I have no clue how to solve: Thanks for the help.

All objects not affected by gravity keep moving in a straight line for infinite...why?

Given$$ f(x) = \arctan\left({\frac{\sqrt{1+x}}{\sqrt{1-x}}}\right)$$ I differentiated and this was my answer. $$\d{y}{x} = \frac{1}{2\sqrt{1+x}\sqrt{1-x}{(1-x)}^{2}}$$ I used implicit differentiation on the elliptic curve $${x}^{2}+4{y}^{2} = 36$$ and it wants two horizontal tangents through...

http://www.physics.sjsu.edu/becker/physics51/images/28_03_Earth_magnetic_field.jpg If this is your magnetic dipole and you start at the north end and follow a field line to the south end, is the magnetic field equal in magnitude the entire way through?

Hello - this is a continuation of a previous thread https://www.physicsforums.com/threads/using-european-230v-50hz-appliances-in-the-us.620097/ Question 1: The final recommendation was to run 3 wires plus ground to the new 220v outlet but the appliance doesn't have anywhere for 3 wires + ground...

Homework Statement Determine the field lines of the vector field ##\vec F = (x^2+y^2)^{-1} (-y\hat x + x\hat y)## Homework Equations Definition of a field line ##\frac{d\vec r (\tau ) }{d\tau } = C \vec F (\vec r (\tau )) ## The Attempt at a Solution From the above equation and choosing...

Hello, I am trying to solve the following simple diffusion equation using the method of lines: du/dt=D(du2/dx2)function k=func1() k = [0, 0, 0, 0, 0, 0, 0.4380, 0, 1e5]; %k(9) initial value of the molecules end %k(7) D/dx2 function...

Homework Statement Is there any difference if I measure static pressure value from the down side of the pipe or up side of the pipe? I am getting an error just small as 300 pascal when I do zero measurement. Here I draw the system also. The diameter of pipe is 10 cm. What could be the possible...

Homework Statement "Complete the diagram to display gravitational field lines between two objects of equal mass." Homework Equations N/A as question is descriptive.The Attempt at a Solution Okay, I know it's a bit of a mess but what I'm trying to show here is that the fields are radial and...

Can anybody suggest good resources for me to learn about the method of lines? I have budget to buy textbooks. The boss has received a "request for proposal" from a client with deep pockets. That means they want us to submit a bid for a contract. The client wants us to apply the method of lines...