3d Definition and 1000 Threads

Not quite understanding what creates a plane, and what creates a line in 3D. Are vectors points in the plane with a line drawn from the origin to the point? Are position vectors vectors drawn between two vectors? If a plane is a vector and a point, how is that different from the description...

What is the normalized ground-state energy eigenfunction for the three-dimensional harmonic oscillator V(r) = 1/2 m* ω^2 * r^2 Use separation of varaibles strategy. Express the wave function in spherical coordinates. What is the orbital angualar momentum of the ground state? Explain? I...

Hi, I would like to measure the power give from a source to a transformer and measure the power consume by a RL component. I see only voltmeter and amperemeter in circuit editor, it's not possible de put wattmeter ? Or maybe there's another solution for find the power ? Thanks in advance ;)

Homework Statement a) Find the cosine of the angles that the line r = [-3,2,5] + t [2,2,√2 ] makes with the coordinate axes. b) If a,b and c are the angles that the line makes with the x,y and z axis respectively, find the value of cos^2a + cos^2b + cos^2c. c) What is the magnitude of the...

I'm trying to plot something like x+y=2 in 3D. The image should look like this: Been trying to do it in Mathematica using Plot3D, but the it treats the input as a function of z. Another example: Plot3D[x=4,{x,0,10},{y,0,10},AxesLabel{x,y,z}] plots z=4, not x=4. A similar thread, with no...

Anyone can recommend me which software is the best for 3D drawing for piping?

Homework Statement a. Suppose you do not know your location (on Earth) or the direction of north. Now suppose you track one particular star in the sky. You measure its exact position in the sky and record the exact time of the measurement. How many such measurements are necessary to deduce...

I don't want to use any game engine. I want to use only C++ to make a 3D Game. How can I do so? I have made many 2D games, like chess, connect 4, mario, snake, etc. But how do i do 3D and make things like DOOM? I use the OLD Turbo C++ Compiler, not Dev C++

Why are there 8 possible moves in 3D random walk? With R being the distance from the origin, how is its relationship with the number of steps and dimensionality? Thx!

Hello All, Please guide me to calculate the resultant of the following two 3D vectors. vec1 =(-0.3960i,4.6660j,15.2610k) vec2 =(-4.1230i,-13.2200j,17.9170k) Thanks Suneyna

just thinking... the energy of an orbital depends on: a)quantum number n b)quantum number l. an orbital will be of less energy when it's more contracted. So technically, 3d should have a lower energy than 4f and hence be contracted. BUT IT'S THE OTHER WAY AROUND! help? thank you!

3D Printer! :Researching 3D Printers for Purchase! Hey All! So I have been recently assigned to do some research towards purchasing a 3D printer. I find the idea of 3D printers very fascinating. I'm hoping that I can get some feedback from everyone on this forum to make the best decision...

Recently I was assigned to implement a procedure involving "3D projections" to "2D space". Supposing that 3D data is stored in a n x 3 matrix X, the final step involves Y=XP, where P is a 3x2 matrix. However, I would need to be sure about the actual meaning of the word "projection" to 2D. In my...

Do the new optical and time shifting versions of 3D cloaking present a challenge to gravitational lensing as a valid proof of gravity ? Am curious if the time shifting constituent of the theories can mimic the redshifting observed in arcs and lenses also. Seems that with the findings of...

I am confused, how the motion of the planets we observing is circular? The motion of the every object in Spacetime is straight, but as we are watching it in 3D, it seems to be circular. What is the reason behind it? In simple words, how the straight motion of the objects in 4D(spacetime)...

εHi, Based on that hoary schematic cube representation in 3D for stress-strain relationship. Stress tensor {σxx, σyy, σzz, σxy, σyz, σzx} and strain tensors {εxx, εyy, εzz, εxy, εyz, εzx} can be written interchangably. Let's suppose that σzz=σzx=σzy=0 then the reamining terms are written...

tri axial accelerometer Hi, I'm doing a project to do with measuring velocity of an athlete. I'm looking into using a wireless tri axial accelerometer. I can't seem to find enough detailed information into how it works. Could you please help!

Homework Statement Show that f(x,y)=g(x,y)h(x,y) is stationary if and only if: g=0 and h=0 OR df/dx=0 and (dg/dx)(dh/dy)=(dg/dy)(dh/dx) (All the d's in the line above should be curly d's for partial derivatives.) Homework Equations The Attempt at a Solution I tried...

Homework Statement Consider the surface defined by F(x,y,z)=1/2(x+y)^2+(y+z)^2+(x+z)^2=9 (a) Evaluate grad(F) My Solution: grad(F)=(3x+y+2z, x+3y+2z, 2x+2y+4z) (b) Find the highest and lowest points on the surface (i.e. the points where z attains a maximum or minimum). Problem: So I...

Hi. I want to know the equation to draw a circle that's a bit tilted. Imagine a 3D circle that's parallel with the Y axis. Now I want to take that circle and have its center cross through the origin still, but I want it to be θ degrees titled from the Y Axis. I'm using the following...

I read (or heard or saw) somewhere long ago that if you traveled as far as you could go in the Universe you'd return to the exact same point at which you started. If our U is indeed a 'brane, and the previous statement is true, doesn't that whole circuit of travel ending up back at "point A"...

Homework Statement Given a wire with length a and square base b x b (where a >> b), show that the first 1700 (approximately) levels of the electron in the wire are identical for the one dimensional box, when a = 1m and b = 1mm. Homework Equations I know that the allowed energies of...

I'm still looking into this prior to my older thread and someone has told me of a method that I have quoted below; " All measurements are assuming that the pixel width/height is one) Let fov = the field of view, you can decide how much field of view your user will have from the target...

Hello I was sitting and thinking one evening and got this question. In our 3 dimensional universe we have our sun, we know all the parts that makes the sun and how it interact with objects and space around it. If we say that we have a 4 dimensional universe and have the same sun there...

Hi, I am trying to do a simulation for the current distribution in a cylindrical conductor wire using MAXWELL 3D. I used eddy current solver and assigned excitation of current 1A at both ends of the round wire. (I set length L=2mm, radius R=1mm) The field plot seems ok, having highest current...

Homework Statement Find the mass of the solid bounded by the cylinder x^2+y^2=2x and the cone z^2=x^2+y^2 if the density is \delta = \sqrt{x^2+y^2} [b2. The attempt at a solution[/b] I had some trouble looking at how to set up the limits on this integral. What I came up with was: 2...

I have a point in 3D specified by its coordinates (x0, y0, z0) I have a line in 3D specified and bounded by its end points (x1, y1, z1) and (x2, y2, z2) How do I calculate the minimum distance between the point and the line, keeping in mind that it may not be the perpendicular distance...

Hi, I have used Mathematica to determine a 3x3 perspective transformation from one 2D image to another. Let's say that Mathematica gave me the following 3x3 matrix: a b c d e f g h 1 Now, moving outside of Mathematica, I'm trying to use that perspective xform it gave me in...

How can we merge 3 FFT spectrum graphs in one as shown in the picture? AND THANK YOU I have written the codes for the 3 spectrums but need to join them as shown.

Hello. I have the distance formula programmed into my calculator and I searched for a distance formula that includes the z-axis but I couldn't find any. Does anyone know how to make such a program for the TI-84? Thank you.

Say I have an odd shaped rigid body in pure rotation. I fix an orthogonal x-y-z coordinate system to the body, and coincide the origin of this coordinate system to the origin of my global coordinate system X-Y-Z. I have 3 Eulerian angles (as functions of time) which I can use to describe the...

Can anyone help me to find a good 3D plotter for Mac?? I am searching it because I want to plot data that I got from a simulation that I did.

I have a 3D shape described by a triangulation map i.e. a map between the vertices to the faces of the shape which are all triangles. I then sliced the shape by a plane and computed the intersections of the plane and the triangle faces. Each triangle face that intersects the plane, will have...

Hi, There are three variables ax, ay and az, my question is: How to simplify the mean value <(ax^2+ay^2+az^2)^(1/2)> to <|ax|> ? What assumptions are required during the simplification? The statistical property of ax, ay and az is <ax^2>=<ay^2>=<az^2>. The assumption of the propability...

Currently I'm teaching myself Autodesk Inventor and it seems to be going pretty well. I was wondering though, in the job market what program is most used? Also what program is the most powerful in the design process? I guess what I'm really looking for is the program that would most benefit me...

I need to calculate inertia for a mass moving on viviani's curve. Anyone here care do guide me on how to do this ?

Hi guys! Kinda stuck here.. I'm trying to plot the temporal temperature distribution across a metal rod of length 1 meter. The rod is heated at one end and the temperature is measured every 5 cm along the meter rod every 10 minutes for an hour. Basically I have 6 text files, each...

Dear Friends I have made 2D plot in MATLAB and want to convert it in 3D can you give me any suggestions please. if s=x^2+y^3 x=linspace(0,2); plot(y,s,'b') this gives the plot of 2D I want to make it in 3D for any value of z axis(-1 to 1) what changes i have to do ?

I have been trying to find out if this is possible and can't find anything, probably I'm not using the right maths terminology to get it. What I want to be able to do is to take a set of 3d co ordinates and then use some sort of algorithm, formula or similar to convert these into a 2d...

Hi, I need help with the gaussian function in 3D. I'm using the form: z=A*exp( (x-xo)^2/(2σx^2)+(y-yo)^2/(2σy^2)) I know that A is the amplitude and xo,yo are the center coordinate. I found that formula on http://en.wikipedia.org/wiki/Gaussian_function and they say that σx and σy are...

I have a question in my book that states: "T or F The natural domain of f(x,y,z) = sqrt(1-x^2-y^2) is a disk of radius 1 centered at the origin in the xy-plane." This is F as the graph is an infinite solid cylinder. But I can't visualize it. If I let f(x,y,z) be z, and square both sides, I...

Hi, Does anyone here know of a software where I can simulate magnetism in 3D - except the expensive Maxwell 3D? Vidar

I would like some help in visualizing electromagnetism in three dimensions. I have researched extensively and have come up with nothing but sine waves and pond ripples. But just like sine waves representing sound, which are three dimensional compression waves, do not represent how sound...

Hi, I need to model heat transfer in a 3D digital environment. I have very little physics / engineering background so I have no idea what's available or what software / methods are used. I have some background in CAD and general experience in Matlab, but this is going to be a steep learning...

Problem10.1, Introductory QM,Liboff. Homework Statement If \psi (\mathbf{r},t) is a free-particle state and b(\mathbf{k},t) the momentum probability amplitude for this same state, show that \iiint \psi^* \psi d \mathbf{r}=\iiint b^* b d \mathbf{k} Homework Equations \psi_\mathbf{k}...

Homework Statement If we have volume integral of a Gaussian function, in phase space for example. F= \int^{\infty}_{-\infty} e^{-aq} d^{3}q Now, I think the the answer would be the standard answer for a Gaussian integral cubed wouldn't it? F=\left(\frac{\pi}{a}\right) ^{3/2} I...

Homework Statement Four congruent spheres, radius length 10 cm, are placed on a horizontal table so that each touches two others and their centres form a square. A fifth congruent sphere rests on them. Find the height of the top of this fifth sphere above the table. Homework Equations Not...

Homework Statement For two metal plates parallel to each other, when voltages was applied to them, there is an electric field in between. I measured the voltage at 12 points (known x,y,z) between them. these 12 points formed a rectangular box (three on each of four lines, which is...

Hi all, I'm having problems with something I'd like to do. Basically I have a 3D scatter plot and would like to add a line of best fit to it, I've googled this but most of the answers I get are incomprehensible to me (I'm a chemistry PhD student and my maths isn't amazing). Does anyone...

I am working on a simple ray tracer for rending point clouds in real time. I am not so good with maths, and I am stuck with a fairly simple problem: Given a start point (0,0,0) and a direction (0,90) and a distance 1-100, how do I get the 3d point the line will hit? As this will go...