2d Definition and 1000 Threads

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 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...

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...

2D Kinematics Please Help! I tried so hard Relative to the ground, a car has a velocity of 17.3 m/s, directed due north. Relative to this car, a truck has a velocity of 20.5 m/s directed 48.5 ° south of east. Find the (a) magnitude and (b) direction of the truck's velocity relative to the...

in the book i am asked to find the maximum height of a football thrown from a quater back to a receiver. The givens are the the ball starts 1.8m off the ground, travels at 20m/s, end 1.8m off the ground, and travels 30m. I NEED HELP!

Homework Statement The Attempt at a Solution I don't know how to choose u. I presume we look in 2D; I thought u should look something like: u = \left[ \begin{array}{c} \psi \\ \psi \end{array} \right] and c= \phi but that isn't correct.

Hi, Just when I thought I'd grasped the Discrete Fourier Transform properly,something comes along and messes me up ... and my books don't seem to treat it. Say you have a square 2D image and you want to do an Ideal LowPass Filter. Well, in general, filters need to be odd-number-sized so...

Homework Statement Consider the arrangement of point charges shown below. Calculate the net force on point charge 1 given the arrangement of the point charges and the separation of the charges. 1=2=3=e- 2=e+ r=0.4cm =0.0004m K=9x10^9 Fnet=? Please use this link for an image of...

Does anyone knows some good finite elements routines in 2D?

Ok, this may be a silly question and I probably should have asked it a long time ago.. Do the planets in our solar system rotate around the sun in two dimensions? By that I mean if you take the standard XYZ coordinate system, the planets exist only in the XY plane, right? Or is this just what...

HI, I'm constructing a 2D nozzle for fluid testing. I have made my nozzle X5 larger and taken a 1/8" slice. Now I'm having trouble designing the 2d nozzle so that the exiting air will have a velocity of 3ft/s. I must maintain an Re number of 1000 as well. My problem lies in that fact that. I...

Question: Determine whether the following sets of vectors form bases for two-dimensional space. If a set forms a basis, determine the coordinates of V = (8, 7) relative to this base. a) V1 = (1, 2), V2 = (3, 5). On the first part of the question, I'm a little foggy on how I go about...

Homework Statement The problem is a 2D one, regarded as seen from above (no gravitational forces are relevant). A pulley is attached to a cable and is pulled with the force "F" towards north. Through the pulley goes another cable and is firmly attached to the ground on one end and attached to...

So we've just finished our unit on Momentum and Energy in our grade 12 Physics class and today we were given a basic assignment that is to help us think "out-side" the box of typical questions. This particular question has me going insane...I just can't make the connection as to what to do. The...

Homework Statement If a long jumper at the top of his trajectory is moving at 6.5 m/s (horizontally) and his centre of mass is 1.1m abover where it was when he launched into the jump, how fast must he have been moving when he launched? Homework Equations Vx = Vox + ax*t The...

Homework Statement A ball is tossed from an upper-story window of a building. The ball is given an initial velocity of 8.40m/s at an angle of 17° below the horizontal. It stikes the ground 4.00 s later. a. How far horizontally from the base of the building does the ball strike the ground...

Homework Statement Given some dispersion relation for the tight binding approximation in 2D: e(k_x,k_y) = -2t_1[cos(k_x*a)+cos(k_y*a)]-4t_2[cos(k_x*a)cos(k_y*a)] Show that the density of states has a logarithmic singularity for some choice of parameters t_i. Homework Equations g(e)de=g...

[SOLVED] Laplace equation, cylindrical 2D Homework Statement I am given the Laplace eq. in cylindrical coord. (2D), and I am told that we can assume the solution u(rho, Phi) = rho^n * Phi(phi). Find the general solution. The Attempt at a Solution My teacher says that the general...

need halpe please hii i need aprogram to render the 3D & 2D of some atomes and mouloculers like [H2o] [DNA] [anziames]...etc

http://www.vrlab.umu.se/research/phun/ Looks fun.

This is obviously true for perfectly "flat" surfaces - and, intuitively, it seems to be true for all other sorts of 2d surfaces. Is this a proven result? If so, can we generalize?; can we say a n-elements system of coordinates uniquely identifies a point on any n dimensional object? It carries...

Homework Statement Is there an analog to Gauss's theorem (sorry about the title) in 2D. The reason is to develop the continuity equation in 2D.Homework Equations In 3D it is. \int_{S}{\bf A}. d{\bf S}=\int_{V}(\nabla . {\bf A})dV (please forgive my latex. A and dS should be vectors). The...

I would be eternally grateful if I could get some help. The question is: Write down the Haniltonian operator for the 2D harmonic oscillator with the potential V(x,y)=1/2(x^2+y^2). By using teh separation of variables and theform of the eigenvalue for the 1D harmoinc oscillator, find the...

Awesome 2D Physics tool. http://www.youtube.com/watch?v=0H5g9VS0ENM" I downloaded it: http://www.acc.umu.se/~emilk/" Fiurst thing I built was a compound pendulum. But man I need a faster 'puter.

Homework Statement Ok, I'm making an algorithm to calculate some stuff, and meanwhile, i needed to compute a 2D collision between 2 particles of same mass. To work that out, I needed to change referential to Mcenter. The problem was there... Homework Equations Vcm=(v1+v2)/2 (m1=m2)...

1. A stone is thrown horizontally from the top of a 20 m high tower. It strikes the ground at an angle of 45 degrees. With what speed was it thrown? I'm having trouble with this problem, any help would be greatly appreciated. This is what I have: I know that Vox = Vo cos 45 and that...

[SOLVED] 2D motion A shell is fired with a horizontal velocity in the positive x direction from the top of an 80 m high cliff. The shell strikes the ground 1330 m from the base of the cliff. http://courses.science.fau.edu/~rjordan/quizzes/phy2043/images/3.07.gif I think relevant...

For a course on tensor analysis, we were asked to perform some calculations regarding a 2D space embedded in 'regular' Euclidean 3D space. I've gotten some results, but I've hit a snag... Homework Statement The following functions relate the coordinates in the embedding (3D, Euclidean) space...

Homework Statement A man jumps from the top of a building to the top of another building 3.7 meters away. After a running start he leaps at an angle of 14 degrees with respect to the flat roof while traveling at a speed of 5.1 m/s. The acceleration of gravity is 9.81 m/s/s. To determine if he...

I have a question regarding various planes in an FCC, and determine their packing fractions. I searched but couldn't find anything :) For example, one of the planes is the (100) plane, and I have said there are 2 full atoms (1 in the middle, and 4 quarters from each side), distance 'a'...

[SOLVED] 2D Kinematics Help Basically I want to make sure that I have worked this correctly and find out what I did wrong in Part 3, as my solution is not logical. Problem Consider a ball thrown up from the ground. It passes a window in the time interval .251s. The distance across the window...

Homework Statement The program is to read in a file full of numbers formatted like this: The first line contains a single int n. Following this line, there will be n lines with n ints each separated by whitespace. So I have asked the user for a file path and read in the first number ('n')...

Hi! Does anybody here have experience with the FEMM simulation software? Its pretty popular in the engg community. I basically use it for simulating magnetostatic problems. If you do (and if this is the right forum, it is EE after all), could somebody tell me how I can do transient...

I am in eleventh standard , In my book it is given about the plane progressive simple harmonic wave , later somewhere is mentioned about intensity of wave what my doubt is intensity is defined as energy/area but what about waves in 2d or 1d plane SHW are 1d as wave progresses in x-axis...

Here's another variable problem Homework Statement An extreme sportsman jumps from one cliff to another of width (w) by leaping horizontally by vo. With a height difference of h (where the starting cliff is higher) what is vo so he doesn't miss the cliff? (also, what is the direction of...

I'm wondering -- would you get the phenom. of Bose-Einstein condensation in a 2D system. My intuition is "no", but I'm having a hard time saying why. I suppose I could try and work it out mathematically (no time, right now) -- perhaps someone has? -- but a physical explanation would be nice too...

So.. we've got a 2D crystal, corresponding an infinite square net with +-e0 charges in each one (see the atached photo). Now I'd like to calculate the constant k..when r goes to infinity... We = k (+-e0)*(+-e0)/(4 pi eps0 r)..on the positive charge in the center caused by the negative and...

Hi all, I wanted to know if anyone had any advise on how to transform a 2D geometric shape into a 3D one. I have some 2D shape which is given by the equation f(x,y) = const. = k. I wish to rotate this 2D shape into the 3rd dimension by an angle theta and then write down what the 3D function...

Question Details: The following blocks have been encoded using the two-dimensional parity error detection scheme. That is, the rows have been encoded using odd parity and the last row holds the parity bits of the columns which have also been encoded using odd parity. There are two possible...

[SOLVED] expectation value of P^2 for particle in 2d box I am having difficulty in finding the right way to find this value. my book only give the 1d momentum operator as: ih(bar)*d/dx(partials). i see its much like finding the normalization constant. which i have done using a double integral...

(my first post) so i was watching a video on einstein's general theory of relativity when i realized that every solar system diagram shows the planets revolving around the sun on a two dimensional plane. do they really revolve at all the same level of say..a flat zero degrees, or do they...

Homework Statement there are two masses, the smaller sitting still, and the larger with 5 times the mass of the smaller hits it going 12 m/s. the smaller rebounds at an 80 degree angle from the direction of the original mass. the collision is elastic. find the speed of both objects and the...