3d Definition and 1000 Threads

Hello, i am Fluent beginner..im doing thesis about aerodynamics on solar race car.. have to study about its drag and lift coeeficient.. i need help about how to 3D mesh the car and the wind tunnel.. now i have draw the car model as one part and the big square as wind tunnel as another...

Aloha! This is my first post, and I hope that I am posting in the correct area... I need help with a math problem that is beyond my math skills. If anyone can answer it, I'd be very grateful! Here's my problem: Imagine two particles, say "a" and "b" that are traveling (in positive...

Hi there, So here's my assignment: ''The velocity of a positron is measured to be: vx=(4.00±0.18)*105 m/s, vy=(0.34±0.12)*105 m/s, vz=(1.41±0.08)*105 m/s. Within what minimum volume was the positron located at the moment the measurement was carried out?'' I think I'm not wrong when I say that...

I am currently looking at constructing a model of a 3D printed item based on a sequence of images of each layer of the print. At the moment the sequence of images are transformed to black / white and run through a Moore Neighborhood algorithm and then a voxel representation of the printed...

I just downloaded scilab because Wolfram Alpha wouldn't want to plot the function I'd like. In a physics problem I've found the temperature distribution of a 2 dimensional system. I'd like to visualize this function in 3d. The function I want to plot is u(x,y)=\frac{1}{\pi} \arctan \left (...

ok here goes... In a three dimensional environment. i am standing at point (0,0,0) and there is someone else standing at (10,0,0) I start moving with a velocity of (1,2,3)/s and the other guy wants to meet me. I know that he is approaching the point of intersection at 4m/s (that is...

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...

Homework Statement Ok I'm able to track one star in the sky, over a period of one hour. We use three measurements to find the angle of the arc traced by the star. The three measurements also constitute two vectors. We can take the cross product of those vectors and it will give us a vector...

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...

I have a problem in the understanding of stiffness. For a simple cylinder with force acting axially, the definition of stiffness works ie Force per unit displacement. but what happens if the cylinder is bent, or even better a plate clamped on the edges with a UDL? In this case displacement would...

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...

Ok here is what I did: T=\int \vec{\tau} \cdot d\vec{\theta } = \int\frac{\mathrm{d} \vec{L}}{\mathrm{d} t}\cdot d\vec{\theta } = \int \vec{L}\cdot d\vec{\omega} = \int I_{ij}\vec{\omega}\cdot d\vec{\omega} Where I is the inertia matrix. when I carry that out, I get: T=...

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.

Dear fellows, I am trying to plot a 3D graph, determining the x and y values using an array and the z values using if/else. This is the code I am playing with but I can't get it to work: xmin=-1000; xmax=1000; division=1.0; num=((xmax-xmin)/division)+1; for i=1:(num/2)...

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...

Homework Statement Just need someone else to double check more work. I just want to know if I'm separating these variables correctly. Homework Equations \frac{\partial^2u}{\partial t^2} = c^2\nabla^2u The Attempt at a Solution Allow u(\rho, \theta, \phi, t) = T(t)\omega(\rho...

Im a visual person, and I have a strong interest in Physics for some reason too. Im trying to picture how Gravitational waves would look not in Spacetime but in normal space. Are they like concentric rings surrounding the source? And how do they differ in shape when there are 2, 3 or more...

This is more of a general conceptual question than a specific homework problem. I know how to do these problems, but I'm not understanding part of them. So, with a given stress element, I first look at one specific face, and plot a two-dimensional Mohr's circle. Then, I find the center...

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...

Homework Statement There is a constant potential, V0, in the region -a<x<a, -a<y<a, -b<z<b, and V=0 otherwise. Particles of mass m are incident on the scatterer with wave vector k in the x direction with a flux at the origin of one particle per second per cm^2. There is a detector with...

Homework Statement I am trying to analyse a 3D truss problem (attached). The idea is that when you pull with a force F in the direction of the arrows, the pin in the middle will be pressed downwards, decreasing the length of p2. In general the overall structure will be consistent of a series...

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...