Lines Definition and 1000 Threads

hello, i'm a beginner in programming. i wrote a program to calculate velocity correlation function. i do not get any compilation errors but the lines after line number 42 are not being read. could someone tell me what is it that I'm doing wrong? thanks a lot! svartak !program to...

Homework Statement Determine vector, parametric and, if possible, symmetric equations for the line through Q(2, -1, 3) and the mid-point of the line segment from L(3, -2, 5) to M(1, 4, -7). Homework Equations Midpoint equation=( (x1+x2)/2, (y1+y2)/2, (z1+z2)/2) The Attempt at a...

Are there sky surveys that perform gamma-ray absorption spectroscopy? I was wondering if dark matter might absorb gamma radiation. I have done a simple Bohr-atom type calculation assuming a dark matter model of a bound state of a North and South magnetic monopole and found a Rydberg energy...

I think the title says it all. Scientists use their knowledge to; solve problems, make life easier... and to impress chicks. What are your favourite pick-up lines?

Homework Statement Explain why the electric field is perpendicular to any conducting surfaces in static situations. Is this true in general (i.e. even for changing electric or magnetic fields)? Are there similar conditions on the direction of a magnetic field at the surface of a...

Homework Statement r=2-3cosθ Find the tangent line at any point, and at the point (2,∏) Find the tangent line(s) at the pole Homework Equations Do I have to use x=rcosθ and y=rsinθ to convert it to rectangular to find slopes? The Attempt at a Solution Is the point 2∏ even a...

Homework Statement A line passes through the point (1, -4) and is perpendicular to the line 3x + 2y – 6 = 0. Determine a scalar equation for the line. Was also given this: Find a vector which is normal to the line and then use the dot product of this vector and P0P. Homework Equations...

Homework Statement Determine the field lines of the vector field f: R^3 --> R^3 defined by f(x,y,z) = (x/(1+z2) , y/(x2+y2) , 0) Homework Equations The Attempt at a Solution I know that my vector field is: F(x,y,z) = (x/((1+z^2)*(x^2+y^2))*i + (y/((1+z^2)*(x^2+y^2))*j + 0k I choose...

I am writing my senior thesis on communication networks and this question sort of popped into my head: What determines what frequencies you can use in a landline connection? (e.g. say I have a wire connecting point A to B to send a bunch of signals, what prevents me from using the entire...

I have a property with a 3 phase underground power line. The power line doesn't go near the house but happens to pass directly underneath the shed, which is in the form of a sea container. Whenever I'm working inside the container, I feel sick. The symptoms are similar to those described by...

Hi there, The two given lines: 1) x / 2 = (y-1) / 2 = z 2) x + 1 = y – 2 = (z + 4) / 2 I need to find the common perpendicular between them. Though when I tried to calculate the distance between them, I get 0. Can someone please help? Thanks in advance

Hi there, The two given lines: 1) x / 2 = (y-1) / 2 = z 2) x + 1 = y – 2 = (z + 4) / 2 I need to find the common perpendicular between them. Though when I tried to calculate the distance between them, I get 0. Can someone please help? Thanks in advance

Does anyone know if there is a non-Euclidean geometry(or something like that) where the circle becomes a line or a pair of parallel lines? ...or even where the circle becomes a set of parallel lines? ...i'm doing some work in Guitar Theory and this situation appears... Thanks The...

Homework Statement Draw flow lines of f(x+iy)=x^2-y^2+2ixy Homework Equations n/a The Attempt at a Solution I know the flow is irrotational and sourceless by Cauchy Theorem but I don't know how to draw the flow lines... I'm thinking I might have to parameterize the equation and...

Homework Statement Two coplanar lines l1 and l2 are perpendicular to each other, l1 passes through the points (-3,2,3) and (-8,10,6). Find the equation for l2 if it passes through the point (7,49,25) Homework Equations The Attempt at a Solution determine the equation of l1 and use...

Is the width of spectral emission/absorption lines stretched in either cosmological or doppler redshift?

Homework Statement Two coplanar lines, a and b are perpendicular to each other. a passes through the points (3,2,3) and (8,10,6). Find the equation for b if it passes through the point (7,49,25).Homework Equations The equation were trying to find is r = [x,y,z] + s [x1,y1,z1] + t [x2,y2,z2] The...

A microprocessor with 12 bit address bus will be able to access how many kilobytes of memory ?? 2^12 = 4096 = 4 kB of memory Is it right ? Thanks.

Homework Statement Two coplanar lines, a and b are perpendicular to each other. a passes through the points (3,2,3) and (8,10,6). Find the equation for b if it passes through the point (7,49,25). Homework Equations The equation were trying to find is r = [x,y,z] + s [x1,y1,z1] + t...

Hey all, I am plotting some data using MATLAB and have a question. Basically, this is what I'm trying to do. I am calling a bunch of data from Excel, plotting this data in MATLAB (it gives me two lines), and then calculating the polyfit values for each line so I can find the equation y = mx...

When a completely ionized atom of hydrogen captures an electron, the latter may conceivably cascade toward the nucleus by jumping successively from one permitted orbit to the next. If we could watch the light emitted by this single atom, to what lines of the complete hydrogen spectrum will the...

Ok, Please correct me if I'm wrong; Flux lines are a sort of mathematical visualisation of magnetic fields, they do not exist. As such, there still exists a magnetic field between flux lines (?), just in calculations we use flux lines because they are simpler (?). In voltage transformers...

I had an occasion to hook up a piece of open ended coax to a network analyzer. I know the wire has some pF per foot but I expected it to be linear over inches but it wasn't. In other words instead of 5 inches = 5X the pF per foot, the capacitance rises sharply near the end of the coax. Any idea why?

Hello, a beginners question here. Can someone please tell me why transmission lines use two wires instead of just one ?

Homework Statement I have 2 parametric vector equations (of a line) r(t) = (2,-4,4) + t(1,-3,4) s(t) = (1,-1,0) + t(2,-1,1) how do i find the coordinates for which they intersect each other? The answers is (1,-1,0) Homework Equations x=a+λv, for some λ in ℝ (parametric vector...

Hello all, The standard meter was said to be the distance between two scratches on a platinum iridium bar. http://en.wikipedia.org/wiki/Metre Where are these scratches? I only see the bar.

Homework Statement I am given the equation for the potential of an arbitrary dipole. I need to draw the electric field lines for this dipole in a plane, and also show that these lines are perpendicular to the equipotential lines. I have already derived the equation for the electric field using...

Homework Statement I am given the equation for the potential of an arbitrary dipole. I need to draw the electric field lines for this dipole in a plane, and also show that these lines are perpendicular to the equipotential lines. I have already derived the equation for the electric field using...

I posted several questions on Galilean and Minkowskian spacetime on this forum lately, but I just don't seem to be able to get a real grip on things. I noticed that the core of my problems mostly arise from the definition of world lines. Therefore I tried formulating a definition of them in both...

I am trying to make a software to calculate electric field near transmission lines. When I checked it I got one awkward looking result. At any point near the Transmission line, I guess the time average (or net) Electric Field should be 0. Why should it have any preference on a value and hence...

Hello, everyone. Let's say I have two rectangles, j and k, having areas J and K, respectively, such that area J is less than area K. For clarity's sake, I will set each rectangle on the x-axis of a separate graph. Now, I begin to "smash" each rectangle into the x-axis. The area of each...

Homework Statement Suppose L1 and L2 are skew lines. Is it possible for a non-zero vector to be perpendicular to both L1 and L2? Give reasons for your answers. Homework Equations I know that skew lines are not parallel or intersect. Also, they don't lie on the same plane. The Attempt...

given the lines in space L1 : x = 2t + 1, y = 3t + 2, z = 4t + 3 L2 : x = s + 2, y = 2s + 4, z = -4s – 1 Find the point of intersection of L1 and L2. How do i solve this?

Homework Statement Find the point of intersection of the lines r(t)=< 2t+1, 3t+2, 4t+3> and x=s+2 y=2s+4 z=-4s-1 Then, find the plane determined by these lines. Homework Equations Intersection is when points meet. So, just equating x,y, and z variables will yield the point of...

Hey all, Between two devices, I will need to have a coaxial line (with SMA connections on either end) connecting them. The operating frequency of the signal I am propagating is approximately 125 MHz. With this said, the wavelength (assuming ideal) is 2.4 meters. I have heard from numerous...

Homework Statement The lines in a grating are uniformly spaced at 1530 nm. Calculate the angular separation of the second order bright fringes between light of wavelength 600 nm and 603.11 nm. Answer in __mrad Homework Equations Theta = sin-1 ((m*lambda*2)/(d)) The Attempt at a...

Homework Statement Find the equations of all the lines through the origin that are tangent to the curve y = (some complicated cubic function) I looked up the question in google and found a much simpler example, y = x^2 passing through (1,-1). However, I don't even get what's going on...

Hey everyone, First I'd like to say my thanks to the community for all the information I managed to glean while lurking on the forum and doing my schoolwork over the last year or so. It's been an invaluable resource to me! Now, on to my question. (I see that it says not to post homework...

Homework Statement Find equations of both the tangent lines to the ellipse x2 + 4y2 = 36 that pass through the point (12, 3). Homework Equations The equation of an ellipse is x2/a2 + y2/b2 = 1. I converted the given equation to x2/36 + y2/9 = 1 by dividing each value by 36. The...

Does Kaluza Klein theory allow one to think of the electric field lines of a point charge or a dipole differently. Is there any insight as to the nature of those field lines? Thanks for any help!

Homework Statement Find the co-ordinates of all points on the curve f(x)= x3 whose tangent lines pass through the point (a,0) Homework Equations f '(x) = nxn-1 The Attempt at a Solution I am really not sure how to attack this question. My initial thoughts are to find f '(x) then...

Given the mathematical expression of an electric field, how to find its field lines?

Homework Statement Hey we have started solids of revolutions using disk, washer, and shell methods. But I came across a problem i cannot figure out. "The region of the graph of y=x^2 and the x-axis, for 0<x<2, rotated about the line y=4. Homework Equations Area of a circle = ∏r^2...

Homework Statement Consider the line L(t)=<1+5t, 3+t>. Then L intersects: 1. The x-axis at the point (-14,0) when t= -3 2. the y-axis at the point (0, 14/5) when t=(-1/5) 3. the parabola y=x^2 at the points ____ and ____ when t=____ and ____. Homework Equations y=x^2...

Homework Statement Determine if the lines r1=<1+2s,3+2s,2-2s> and r2=<2+t,6-t,-2+t> are parallel, intersecting, or skew. If they intersect, find the point of intersection. Homework Equations x: 1+2s=2+t y: 3+2s=6-t z: 2-2s=-2+t The Attempt at a Solution I set the components of...

Homework Statement If the distance of any point (x,y) from the origin is defined as d (x, y) = max {|x|,|y|}, d (x, y) = a non zero constant, then the locus is (a) a circle (b) a straight line (c) a square (d) a triangle Homework Equations The Attempt at a Solution I don't...

Homework Statement A meteorite found in Antarctica contains a trace of a mysterious element. Its spectral lines are all multiples of a frequency f0. The multiples are: 1, 2, 3, 5, 6, 8, 10, 11, 13, 16, 18, 19, 21, 26, 29, 31, 32, 34, 42, 47, 50, 52, 53 . The frequencies in bold have...

Homework Statement http://www.xtremepapers.com/Edexcel/Advanced%20Level/Mathematics/Subject%20Sorted/C3/Elmwood%20Papers/Elmwood%20B.pdf Question 8(b) Homework Equations The Attempt at a Solution Ok so I found both values of dy/dx for BOTH EQUATIONS y = x2 - 4x → 2x - 4 y = |4x - x2| →...

The site http://physics.nist.gov/PhysRefData/Handbook/Tables/hydrogentable3.htm shows the intensity of various photon energy values from hydrogen. I was not able to see how this intensity was observed (ie. was it from a specific experiment, or does one simply look at the sun and count photons...

The Following data table provides information about a crate of radishes that is sliding down the ramp of a delivery truck time position 0 ------ 0 2------ 0.6 4-------2.4 6------- 5.4 8------- 9.6 10------ 15Next it asks you to draw a position time graph, which i did, and its identical...