2d Definition and 1000 Threads

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...

Hi, I've been searching the internet for useful information regarding this but I cannot find anything that helps me completely. I am working on a project on my own where I have identical cylindrical objects (standing up on their flat sides like hockey pucks on ice - so from a 2D "overhead"...

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...

When Babe Ruth hit a homer over the 7.5-m-high right-field fence 95 m from home plate, roughly what was the minimum speed of the ball when it left the bat? Assume the ball was hit 1.0 m above the ground and its path initially made a 38º angle with the ground 2. Vx= Vcosθ...

Homework Statement By resolving the momentum equations parallel and perpendicular to the incident beam direction, show that α is related to the speed v2 of the recoiling particle by: cos α = m2*v2/(2μ*u1) where μ=m1m2/(m1+m2) Homework Equations See attachment for diagram...

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...

Homework Statement I am given an initial- and boundary value problem for the two dimensional wave function, and I must solve it by d'Alembert's method. It is all good, but I am given the initial velocity: g(x)=x(\pi-x). I have to find the odd extension of this on the interval -\pi to...

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...

1. A ball is dropped of the top of a building whose height is d. The ball falls the last 2/3 of its distance in 3 seconds. What is the total time of its fall? What is the total distance of its fall? I used this equation to start this problem...

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...

A fireworks rocket is moving at a speed of 45.0 m/s. The rocket suddenly breaks into 2 pieces of equal mass, which fly off with velocities v1 and v2. v1 creates an angle of 30 degrees above the x-axis and v2 creates an angle of 60 degrees below the x-axis. What is the magnitude of v1 and v2?

Urgent!HELP!A problem on 2D kinematics Homework Statement A flock of Canada geese directly fly above Kingston is flying due north at a speed of 25km/hr. A second flock directly above Gananoque, 30km to the east of Kingston, is flying in a northwesterly direction at the same speed. Assume...

1. Homework Statement A hunter wishes to cross a river that is 1.5 km wide and flows with a speed of 5.0km/h parallel to its banks. the hunter uses a small powerboat that moves at a maximum speed of 12 km/h with respect to the water. What is the minimum time necessary for crossing? 3...

I am using separation of variables and superposition to solve: u_{xx}+u_{yy}=0; for (x,y) \in (0,L) X (0,H) u(0,y)=f(y); u(L,y)=0; u(x,0)=g(x); u(x,H)=0 Is it correct to assume that I can write my solution as: u=u_1+u_2 Where: u_1 is the solution with BC u(0,y)=0...

HELP! A question on Kinematics in 2D & 3D? Homework Statement A gun is placed at the base of a hill whose slope makes an angle alpha with the horizontal. If the gun is set at an angle theta with the horizontal and has a muzzle velocity Vo, find the distance, measured along the hill, at...

Hey everybody, \int_{B(0,\epsilon)} log \frac{1}{r} \ dxdy \ = \ \int^{2\pi}_{0} d\theta \ \int^{\epsilon}_{0} log \frac{1}{r} \ rdr when r = r(x,y) and B is a small ball with radius \epsilon Is this right? I haven't done this in forever and I need to be sure. Thanks!

Homework Statement A hunter wishes to cross a river that is 1.5 km wide and flows with a speed of 5.0km/h parallel to its banks. the hunter uses a small powerboat that moves at a maximum speed of 12 km/h with respect to the water. What is the minimum time necessary for crossing? The...

Homework Statement See Pic. Update: Pic works, take a look Since the pic is not loading correctly yet, I shall try to described the situation. Ball 1 is coming in on the x-axis and impacts two balls (2 & 3) which are arranged vertically, centered at x=0 and the point at which they...

Homework Statement some one walking three directions 0.35 east then 0.75 south then 2.95 33 degrees north of west. The whole trip took 2 hours. Magnitude and direction of displacement as well as the magnitude and direction of velocity. Homework Equations r (displacement vector) x (I...

Homework Statement A particle moving at a velocity of 5.2 m/s in the positive x direction is given an accelera- tion of 5.3 m/s2 in the positive y direction for 9.9 s. What is the final speed of the particle? Answer in units of m/s The Attempt at a Solution I multiplied the...

Homework Statement An owl accidentally drops a mouse it was carrying while flying horizontally at a speed of 5 m/s. The mouse drops to the ground 10m below. What is the mouse's impact velocity? Give the answer as a magnitude and clearly defined angle. As of right now I'm not even sure how...

4.In the javelin throw at a track-and-field event, the javelin is launched at a speed of 30 m/s at an angle of 33° above the horizontal. As the javelin travels upward, its velocity points above the horizontal at an angle that decreases as time passes. How much time is required for the angle to...

The two dimensional action is: S_k = \int d^2\sigma\sqrt{h}\left(\partial_\alpha\phi\partial^\alpha\phi - \frac{i}{2}kR^{(2)}\phi\right) where k is a constant, R^{(2)} is the two dimensional scalar curvature. I'm trying to derive the following energy momentum tensor: T_{\alpha\beta}^k =...

2D Kinematics, airplanes crashing wtf?? An airplane is flying with a velocity of 240 m/s at an angle of 30.0° with the horizontal, as the drawing shows. When the altitude of the plane is 2.4 km, a flare is released from the plane. The flare hits the target on the ground. What is the angle...