2d Definition and 1000 Threads

Homework Statement I am working on a Matlab code that will solve a temperature grid for a 2D transient heat transfer problem. The code seemed to be working well but when I changed the timestep (to find timestep independance) I noticed that the larger the timestep, over the same duration, the...

Homework Statement What is the center of mass a hollow 2D right triangle having legs of length A and B. The sides of the triangle are also extremely thin. Assume uniform density. Homework Equations \overline{x}=∫xmdx/∫mdx The Attempt at a Solution...

Homework Statement A truck of mass 5kg is pulling a smaller truck of mass 2kg up a slope inclined at 10degrees to the horizontal. The trucks are joined together by a light, rigid coupling. The 5kg truck has a resistance of 8N and the smaller truck has a resistance of 6N. The string pulling the...

I think I'm right when I say that the centroid of a 2D shape is found by the intersection of the lines that separate that shape into two shapes of equal areas. Is that correct? I don't want to (for now) think about it in terms of moments and integrals, because frankly, it's a little confusing...

Hello, I would like to ask something about central potentials. When I am working in 3D, I haven´t got any problem solving the schrodinger equation since I use the following change of variables: -\frac{\hbar^{2}}{2m}\nabla^{2}\Psi+V(r)\Psi=E\Psi \Psi=\frac{\chi}{r} With this change of...

Homework Statement A sniper barrel is exactly one meter above the ground and perfectly horizontal. 1000m away is a target one meter above the ground. if the bullet leaves the gun with a muzzle velocity of 1500m/s will it reach the target? (no, next part is my problem) at what angle should the...

Homework Statement g'day everyone, First of all, i would like to thank everyone on this site. You lot have helped me a lot with my homework over the last couple of weeks. anyway to the question. A golf ball is struck at ground level. The speed of the ball as a function of the time is...

hello i want to model and analyze a 2d river which passes a step, in fluent and gambit, but i don't have any idea how should i define free surface between water and air, here is my geometry: i really appreciate if anybody can help me.

Homework Statement Two billiard balls of equal mass move at right angles and meet at the origin of an xy coordinate system. Initially ball A is moving upward along the y-axis at 2.0, and ball B is moving to the right along the x-axis with speed 3.7$m/s$. After the collision (assumed...

hi, I'm not sure if there is a homework forum for programming but I thought I'd post my problem here; I'm supposed to bubble sort a 2d integer array with elements 15 and 2; this is what my code looks like so far: #include <stdio.h> #include <stdlib.h> #include <time.h> #define cards 15 #define...

Homework Statement Car two is traveling due North and collides with Car one, which is traveling due west. Car One has a mass of 765kg and after the collision it travels at 70km/h, 57 degrees North of West. Car two has a mass of 1100kg and after the collision it travels at 41km/h, 44 degrees...

Homework Statement Car 1 (1500kg) is heading north 80km/h, Car 2 (3500kg) is heading east 50km/h. They collide inelastically. a.) Speed and direction of the wreck (car 1 + car 2)? b.) The kinetic energy lost? HERE I HAVE A PROBLEM: c.) What is the kinetic energy of the two-particle...

Homework Statement A 10.0 g marble slides to the left with a velocity of magnitude 0.500 m/s on the frictionless, horizontal surface of an icy, New York sidewalk and has a head-on elastic collision with a larger 30.0 g marble sliding to the right with a velocity of magnitude 0.150 m/s Find...

Homework Statement A plane attains an airspeed of 620 km/hr. The plane sets out for a destination 1085 km to the north (a 0° course) but discovers that the plane must be headed 20° east of north to fly there directly. The plane arrives in 2.00 h. What is the wind speed? What is the direction...

Homework Statement which of the following pairs of quantities transform under rotations of the axes as the components of a two-dimensional vector? a) (x2, -x1) b) (x2,x1) c) ((x1)^2,(x2)^2) Homework Equations The Attempt at a Solution Dont know where to start. i'd appreciate...

I need to initialize the arrays of an object to zero, but when I compile it, it gives me gibberish. Here's my code:

I have a rectangle i am rotating in 3d on multiple axis. i am trying to calculate the 2d height of the rectangle and I am quite lost. For example, if i rotate the rectangle on the x-axis so the top of the rectangle comes forward and the bottom moves back. i can calculate the height of this...

Homework Statement Consider a monatomic ideal gas that lives in a two-dimensional universe (“flatland”), occupying an area A instead of a volume V. (a) By following the logic of the derivation for the three-dimensional case, show that the multiplicity of this gas can be written...

Hi all, I am learning software development and I need to do something that requires some pretty good mathematics I think. I am not very good and been working to solve this problem for a few days now, any help is appreciated. Here is what I am doing: I need to find a way to convert...

Homework Statement Two traffic signals are temporarily suspended from a cable as shown. Knowing that the signal at B weighs 300N. Determine the weight at signal C. Homework Equations Red arrows show lengths of cables and their components. Answer is : W_c = 97.7N The Attempt at a Solution I...

hello, Part of a little project of mine consists of writing C code to build a image file in .ppm format which can be viewed by the simple program xnview. The image size is going to be 256 x 128. My code below generates a image with a smooth transtiton/graident between very dark red to light...

Homework Statement A certain airplane has a speed of 267.2 km/h and is diving at an angle of θ = 28.0° below the horizontal when the pilot releases a radar decoy (Fig. 4-37). The horizontal distance between the release point and the point where the decoy strikes the ground is d = 777 m. (a)...

Hi, I am wondering what is the difference between 1D spectra and 2D spectra? I see many documents talking about one of these 2, but I couldn't find any clear definition...

Homework Statement Three identical point charges, each of mass 80 g and charge +q, hang from three strings, as in the figure. The acceleration of gravity is 9.8 m/s2, and the Coulomb constant is 8.98755 × 109 N · m2/C2. If the lengths of the left and right strings are each 11.1 cm, and...

Given the equation y=x + 1, x=2. Then y=3, I have just clearly specified Exactly where a particle is in 2 dimensions, it is at the location (2,3) in the Cartesian plane. If given the information of where a particle is in 2 dimensions is it possible to find its location in the 3rd dimension?

hello, Part of a little project of mine consists of using arrays, loops and writing files, in C to build a image file in .ppm format which can be viewed by the simple program xnview. The image size is going to be 256 x 128. I can use notepad to create simple images of flags ect. but am...

Hello, i have a problem and i was wondering whether anyone in here can give me a hand. I want to write a 2D array to a file in format that can be read from another program in order to make a 3D graph. I'm using fortran. In few words i want to place the data in columns and rows in the file...

Is there anything wrong with this code? I am trying to make each set of [i] read like this: 0,200,0,200,0,200,0,200... ect. for some reason the numbers are not being set correctly. for (i = 0; i < loopCount1; i++) { for (j = 0; j < loopCount2; j++) {...

Homework Statement An arrow is fired with a horizontal spped of 89 m/s directly at a target 60 m away. When it is fired, the arrow is 1 m above the ground. How far short of the target is it when it strikes the ground? Homework Equations D = vt D = Vit + (1/2)at2 Vf = Vi + at Vf2 = Vi2 + 2ad...

Homework Statement A 17g object moving to the right at 32 cm/s overtakes and collides elastically with a 35g object moving in the same direction at 12 cm/s. Find the velocity of the slower object after the collision. Answer in cm/s. B) Find the velocity of the faster object after the...

Homework Statement Assume an elastic collision (ignoring friction and rotational motion). A queue ball initially moving at 3.6 m/s strikes a stationary eight ball of the same size and mass. After the collision, the queue ball’s final speed is 1.9 m/s . Find the queue ball’s angle θ with...

Gravity decreases at a squared rate with distance. This seems to inversely correspond with the surface area of a sphere as it expands. As such gravity generally decreases proportionally to 1/r². Our universe has 3D volume but math explores the idea of 2D universes. I know it is not a...

Homework Statement A baseball is hit at a 45 degree angle and lands at a distance of 98 meters away. What was the initial velocity of the ball? Homework Equations x=ViT - 1/2gt^2 The Attempt at a Solution i havnt made an attempt considering i am extremely lost and do not know...

How can I create a line tangent to a spline curve interpolated with several points in 2D in pro/engineer wildfire2.

I am currently writing a simulation of the game of life in C. I can create a dynamically sizes 2d array in C. However I then want to pass this array to a function. I have tried to do this however I cannot pass the array if at least one of the dimension sizes and not defined at compile time...

Homework Statement Here is the problem Homework Equations Sum of the forces in x, y and moments The Attempt at a Solution I am having troubles drawing a good FBD.

Note: I figured this out. See my follow-up. Thanks. Homework Statement Two tall buildings of equal height stand with vertical walls 40m apart. A stone is thrown from the top of one at an angle of 25 degrees below the horizontal and directly at the other building with a velocity of 18 m/s...

i seem to having trouble with questions related to elastic collisions. Please help me out if you can please. A 0.25 kg ball is attached to a 26-cm piece of string. The ball is first raised so that the string is taut and horizontal, then the ball is released so that, at the bottom of its...

Homework Statement The pirate is walking the plank. If the plank weighs 500 N and the weight acts at the centre of the plank, how far (distance x) can our pirate, who weighs 780 N, walk before the plank tips and he falls. All dimensions are in meters. ANS: 0.769 m (Look at picture)...

A cannon ball is fired horizontally at a speed of 1000.0m/s from a height of 200.0m a.) How long does it take for the ball to land? 6.39s b.) Where does it land? 6390m c.) What is its velocity when it lands? I get the a and b part...but i just don't understand what am i...

0. Background I am a Doctoral student studying Geographic Information Science. I do a good bit of programming during the course of my work. Recently, I happened upon a problem which I cannot solve on my own (my post-calc math comfort zone is mostly in procedure and repetition, not in...

I wish to approximate the Laplace PDE in a 1/4 plane by truncation of the domain in (x,y) variables: U_xx + U_yy = 0 Now the PDE is approximated in a box [0, xMax] X [0, yMax] and I can solve it using finite differences. But the problems are: 1. How to choose xMAx, yMax appropriately...

Homework Statement A speaker system is suspended by the cables attached at and . The mass of the speaker system is 92.5kg, and its weight acts at G. Determine the tensions in the cables hanging from (a)D and (b)E . Homework Equations \sumM=0 \sumF=0 The Attempt at a Solution...

HI guys, I am having a lot of trouble with determining initial velocity, x and y components etc. Can someone please help me with this Sara drives a rocket sled from rest 25 m up a 15 degree ramp at an acceleration of 8 m/s2. Whats the final velocity? Thank you

Homework Statement The mass of block A is 42kg, and the mass of block of B is 50kg. The surfaces are smooth. If the blocks are in equilibrium, what is the force F? Homework Equations \sumFx=0 \sumFy=0 The Attempt at a Solution I added the vectors do this diagram. The normal force to both...

Homework Statement Salmon often jum waterfalls to reach their breeding grounds. The acceleration of gravity is 9.81 m/s^2 Starting 1.73 m from a waterfall .0386 m in height, at what minimum speed must a salmon jumping at an angle of 44.3 degrees leave the water to continue upstream? Answer...

Hello, I'll give you a little background information on the problem first. It might help. I'm working on a video game actually. It's a 2d side view shooter. In it, there are bots (computer controlled players) that have perfect aim. They can hit (assuming it's in range) a target, accounting for...

On a spacecraft two engines fire for a time of 505 s. One gives the craft an acceleration in the x direction of ax = 5.10 m/s2, while the other produces an acceleration in the y direction of ay = 7.30 m/s2. At the end of the firing period, the craft has velocity components of vx = 3610 m/s and...

Homework Statement Here is the question from my assignment: Homework Equations The Attempt at a Solution I did the free body diagram on the left block. The arrow pointing to the bottom is the Fg, which I will further on refer to as W, the arrow going to the top left corner is...

Dear all, I would appreciate if you could help me with the following problem: A person is standing still on a 2D environment and let's assume that its initial position Xo is given. The person is moving by applying a force function over time say f(t). As a result, using numerical integration we...