3d Definition and 1000 Threads

FEA meshing - why not 2d mesh -> 3d mesh ? Well, I have just realized why the people do not use FEA (finite elements analysis) as often as they should do: FEA preprocessing phase is a disaster! Simply speaking - there is no simple, efficient meshing software available on the market. Existing...

Homework Statement Sphere with P as centre has equation (x-5)^2 + (y-9)^2 + z^2 -100 = 0 Sphere with Q as centre has equation (x-1)^2 + (y+3)^2 + (z-3)^2 -49 =0 These spheres intervine with each other. Find the surface area of the object limited by the two spheres. The Attempt at a Solution...

Been working on this problem http://www.flickr.com/photos/archiphoto77/6179533925 (SEE LINK FOR PHOTO OF PROBLEM) for quite some time now, and the components don't quite add up for me so I am just a tad exasperated... In the x-z projection, I see two forces acting along the x-axis---one...

Hello, i have a function that i need to plot in 3d, it specifically describes the change in the power of a router considering many readings in different places.. so i have the power in dBm against a square space of a building.. if anyone can help me use the surf(), how should i...

Homework Statement If cable AB is subjected to a tension of 700N determine the magnitude of the vertical force F in N. Pic: [PLAIN]http://img225.imageshack.us/img225/9823/capturespm.png Homework Equations Sum of forces in x y and z direction The Attempt at a Solution I am...

hay guys, A three-dimensional harmonic oscillator is in thermal equilibrium with a temperature reservoir at temperature T. Finde The average total energy of the oscillator I have no idea, how can I solve this problem, can you hint me please:rolleyes:

Homework Statement "This problem regards the work required to move a 6nC charge through an electric field given by E = Initial point is at (2,-2,3) Total length the charge is being moved = 2µm Unit path length vector: a_l = -6/7 * a_x + 3/7 * a_y + 2/7 * a_z Homework...

My fluid mechanics textbook says so but gives no proof, I see why it's isotropic but I can't think of why it's the only isotropic tensor in 3D space.

Please see uploaded image... So the question is, what is Hg(dot) ? so I know that I need w1 in rad/sec, so 1800*(2(pi)/60)=188 rad/sec I want to establish a set of moving axes at the center of the rotating disk on the saw that is parallel to the stationary axis. My w is then...

Homework Statement The four points A = (-1, -1, -1), B = (1, 1, -1), C = (1, -1, 1) and D = (-1, 1, 1) are the vertices of a triangular pyramid. Use vectors to calculate: d) an equation (in vector form) of the plane parallel to the face ABC and containing the point D The Attempt at a...

Homework Statement The question is describe the surface whose equation is given 2x^2 +2y^2 + 2z^2 - 2x -3y +5z -2 = 0 now I know it needs to be grouped like this (2x^2-2x) + (2y^2-3y) + (2z^2+5z)=2, however from here I feel like I am forgetting some kind of basic algebra or something on...

Homework Statement Give a formula for a function whose graph is described. Sketch it using a computer or a calculator. A cone of circular cross-section opening downward and with its vertex at the origin.Homework Equations I know how to draw the cone and the properties of a cone, so that's not...

Multivese Travel. Is the theory traveling between Multiverses by striping us into electrons then transmiting them through worm holes then reconstructing them on the other side like a fax! Is it possible?

Homework Statement What are the stationary states of an isotropic 3D quantum harmonic oscillator in a potential U(x,y,z) = {1\over2}m\omega^2 (x^2+y^2+z^2) in the form \psi(x,y,z)=f(x)g(y)h(z) and how many linearly independent states have energy E=({3\over 2}+n)\hbar\omega? Homework...

Homework Statement Prove that the spherical harmonic wave function \frac{1}{r}e^{i(kr-{\omega}t)} is a solution of the three-dimensional wave equation, where r = (x^2+y^2+z^2)^{\frac{1}{2}} . The proof is easier if spherical coordinates are used. Homework Equations Wave function...

Express each force as a Cartesian vector and then determine the resultant force F. Find the magnitude and coordinate direction angles of the resultant force and sketch this vector on th coordinate system. There's a drawing of 1 force(F2) of magnitude 130N, along the negative z direction(-z)...

Homework Statement A perfectly spherical ball is launched horizontally with a linear velocity of 9.9 m/s and an angular velocity (perpendicular to its trajectory) of 4.1 m/s. The ball's mass is 5.0g. (Diagram for explanation of coordinate system)...

Hi all, I apologize in advance if this isn't the right forum to put my question. Homework Statement In our electromagnetism course, we were asked to give the 3D plots of the electric potential V(x/y) for the examples on our book. (We're currently using Introduction to Electrodynamics (3rd...

So... 3d cinema relies on circular polarized light these days. Creating circular polarized light requires the use of a quarter-wave plate, which exploits birefringence to; (a) effectively create two rays of light linearly polarized at right angles (b) retards one of them by a quarter...

Hello, I have a 3D complex wave function and I want to apply a unitary transformation to rotate it with respect to arbitrary axis. Anybody have any ideas how I can do that? Sasha

Hi, I was thinking if there is a way to combine 2D and 3D plots in mathematica. I mean, for example I have a curve on the XY plane and I want to combine it with a graph of a surface, so to have that curve under the surface. The other case , to combine a 2D vector field with a surface ...

When it comes to graphics (what I have learned) is that what you see on the screen is data placed in a memory (video buffer) and then the data or pixel is then plotted onto the screen. So when you manipulate the data in the video buffer you will also manipulate the pixels on the screen. Then...

This is very cool, reminds me of a star trek replicator (kind of). I really want a replicator! Tea, Earl Grey, hot! http://news.bbc.co.uk/2/hi/programmes/click_online/9550469.stm

I am trying to display a 3D density plot for my data [x,y,z] and have tried 'scatter3' however as some data points are the same it does not represent the density very well. There is a cool function called scattercloud on the file exchange, but this is only for [x,y] data. I would appreciate...

Hi Not sure if this is simple or not but I can't figure out how to do it! I am designing a surround that will be constructed by folding a sheet of aluminum. I've got the geometry right in 3d but I want to transpose this to a template. Yes I can measure but I want to solve using maths for...

I'm trying to create a circle in 3D based off of 4 inputs. Position1 Position2 LineLength1 LineLength2 The lines start at the positions, and they meet at their very ends. To do this I've gotten the distance between the points, found the radius of the circle, the position of the center of the...

Some of my friends, upon finding out that I'd joined these forums, decided to give me a math challenge problem they thought couldn't be solved. Does everyone get the same answer? It goes as follows: A knight jumps on a chess board (assume it makes a legal move) from point A to point B...

Hi, I'm pretty rusty with solving linear equations, my equations are: ai = bijkcjk i = 1,... n j, k = 1,... m Would like to know c, given a and b. Need somewhere to start, without having to cover 3 years of notes that I took 5 years ago, thanks if anyone can point me in the right...

Please Help me out with this one. Can all patterns in 2D or 3D, have an equivalent equation in polynomial?

Do you believe this? http://www.youtube.com/watch?v=ZboxMsSz5Aw&feature=share

Hello I am very new to Matlab and need help on importing my data for a 3D plot. Currently, I have x,y,z data that I am trying to import to look like Figure 5 in the following paper: http://www.nature.com/nmeth/journal/v4/n5/fig_tab/nmeth1038_F5.html I have no idea how to import the...

Hello. Let's think that we have a sphere that shown in the picture above. The user will select 4 different point the Earth's surface. Then I must merge this points with shortest curves, then I got a surface. (Like picture 2) Because of the world's surface, our area is elliptical. How can I...

Hello. Let's think that we have a sphere that shown in the picture above. The user will select 4 different point the Earth's surface. Then I must merge this points with shortest curves, then I got a surface. (Like picture 2) Because of the world's surface, our area is elliptical. How can I...

Does anyone know of a 3D model of the data from the 2MASS Survey? I have to imagine it would be incredibly easy to code, but I haven't found one. Thank you.

This question was on my mechanics test but I skipped it. It seemed kinda crazy. Homework Statement In the drawing is described a weightless beam AC connected to the wall through joint C. The beam is supported by two cables, BE and AD, connected to the wall. At the end of the beam at...

Homework Statement I'm trying to go about fitting some (x,y,z) coordinate data that I got out of a simulation to a parabola, but I'm not entirely sure how. Is there a general equation for a parabola that instead of having usual (x,y) coordinates has (x,y,z) coordinates? Homework Equations...

help needed with 3d geometry problem: important! Homework Statement find the equations of the two planes through the origin which are parallel to the line (x - 1)/2 = (-y-3) = (-z-1)/2 and at a distance of 5/3 from it. also, show that the planes are perpendicular Homework Equations...

Homework Statement Homework Equations A=i+j-2k C=j-5k The Attempt at a Solution How to obtain the correct answer?

find the volume enclosed by x=y z=0 and y^2+z^2=x i built \int_{0}^{1}\int_{x}^{\sqrt{x}}\int_{0}^{\sqrt{x-y^{2}}}dzdydx i tried to traw the projection of the top interval in the z-y plane z=\sqrt{x-y^{2}} -> z^2+y^2=x so we have a circle but the radius changes from x to...

FYI. I ran across http://www.visiblebody.com/", and thought I would share... It is pretty cool... Rhody... :approve:

"smooth" curves with cusps in 3d While reviewing basic calculus, I noticed that the curve (1+t^2,t^2,t^3), which clearly has a cusp at (1,0,0), has a derivative curve (2t,2t,3t^2) which is clearly smooth. This struck me as odd since differentiation usually seems to turn cusps into...

Homework Statement Hi, I'm taking Intro to Computing for Engr. and my highest level math course I have taken is Calculus I. I'm trying to solve this problem in my book for Intro to Computing for Engr. and believe that the math is over my head. This may well be the case. But sense this...

Hi there, during my work on my PhD thesis as an experimental physicist I ended up with a very theoretical problem: What does the wavefunction of an electron traveling through a magnetic vector potential look like? I chose a cylindrical coordinate system with a magnetic vector potential A...

How often do you watch 8D movies ? or do you watch mostly 3D. How many theatres are there in your locality? My other question is Do 8D theatres need more preparation time to load the movies ( i guess lot of weeks) than 3D(which is instantaneous)? I think 8D theatres need to prepare for...

Do I have to do three 2D free-body-diagrams like I did here -> https://www.physicsforums.com/showthread.php?t=503368 Or is there a shortcut?

Hi Everyone, Can anyone tell me an "open source 3D MAGNETIC FIELD SIMULATION SOFTWARE", which can add more than 3 magnetic fields and then give their resultant magnetic field... Any help will be appreciable. Regards, hsn

Homework Statement Compute the centroid of the region defined by x^{2} + y^{2} + z^{2} \leq k^{2} and x \geq 0 with \delta(x,y,z) = 1. Homework Equations \overline{x}=\frac{1}{m}\int\int\int x \delta(x,y,z) dV \overline{y}=\frac{1}{m}\int\int\int y \delta(x,y,z) dV...

I recently fall upon this principle while trying to do this 3D mechanics exercise. http://img193.imageshack.us/img193/1416/legitwheel.jpg Looking from a side view (only z and y axes), this should be about right: http://img28.imageshack.us/img28/5758/momentsq.jpg Ignore the question marks...

I've kicked it up a notch and tried tackling 3D statics :approve: Homework Statement http://img849.imageshack.us/img849/4640/attempt01drawing.jpg A rectangular board is held in the condition shown in the drawing by clutching devices A and B (I couldn't find the exact translation in Hebrew...

Hi, have worked out the formula for a hyperbolic spiral space curve to be r(t)=1/t X cos(alpha)+1/t X sine(alpha) + t and obtained the tangent vector T, normal vector N, and curvature (kappa) with the z axis being the central axis of the spiral. Am having trouble finding the formula for the...