2d Definition and 1000 Threads

Homework Statement A basketball is thrown from a height of 2m. The direction of its velocity when it hits the rim of the basketball hoop is 45 degrees below the horizontal. The basketball hoop is 3m above the ground and 4.5 m in front of the shooter. How long does the ball take to hit the rim...

I have this code that i have been working on that will interpolate and integrate some data. I need to read this data from a file with unknown rows and columns to a two dimensional array/matrix so that the data can be broken down further into one dimensional arrays from the parent 2D array's...

Hi all, I am wondering how I plot the steady state temperature distribution of a square flat sheet in maple. I solved the initial partial differential equation I was given and ended up with a function generalized as T(x,y) =(constants)*sum(stuff). Which is a Fourier series representing...

Homework Statement Ok, I'm learning C programming and I'm trying to create a dynamic 2D array. This is the code that seems to work in creating a dyamic array. I found it in a book. //rows and cols are values entered by the user when the program runs. int **(matA) =...

Homework Statement The stoplight had just changed and a 2000 kg Cadillac had entered the intersection, heading north at 3.0 m/s, when it was struck by a 1000 kg eastbound Volkswagen. The cars struck together and slid to a half, leaving skid marks angled 35 degrees north of east. How fast was...

http://imageshack.us/a/img824/1121/asdasdaw.png I am having trouble completely understanding what the question wants. I know it is quite clear but the part I am having trouble is the following. It says 'pretend' w(x,t) is a solution to the 2D equation, just independent of y, then to...

1.A piece of ice falls on a frozen lake and breaks up into three pieces which go off in the directions shown in the diagram below. The mass of the bigger piece is 4 kg and it moves with a speed of 4 m/s straight down, If the two smaller pieces are 2 kg each and break off at 45 degrees each. What...

Hi guys, i need help for homework, it seems easy, but i can't do it:cry:, no calculation to do only writing 2D coordinates in different frames. Homework Statement The hallmark of an inertial frame is that any object which is subject to zero net force will travel in a straight line in a...

Homework Statement http://imgur.com/fGYf0 Stuck on #3 Homework Equations V = Vi + a*t Y = (1/2)gt^2 + (ViY * t) + Yi The Attempt at a Solution I have found the vertical and horizontal components and the initial velocity. ViX = 6.2 ViY = 9.922 Vi = 11.7 Yf = 0 Yi = 7 Xi =...

Hi All, I'm looking for help in converting 2D density (objects/area) in a circle to 3D density (objects/volume) in a sphere, the circle and sphere having the same radius and distribution of objects being uniform. To make this problem more intuitive, here's a sample application: both crabs and...

Homework Statement http://i.imgur.com/0h6dF.png Homework Equations ƩFx=0 ƩFy=0 ƩMo=0 The Attempt at a Solution not sure what unknowns are

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 along the y axis at +2.0 m/s, and ball B is moving to the right along the x axis with speed +3.7 m/s. After the collision (assumed elastic)...

is it possible to use renormalization group theory to get the critical temperature of the 2d ising model? or even, is it possible to show that there is a critical point?

where can I find them? all forms to find out any missing quantity?

Hello- I am trying to find a reference describing the z(or c) component of the basis vectors for graphene. I seem to recall that there is a slight bend such that half of the atoms lie slightly above the plane. However, every paper I have found references the perfect 2D lattice of Graphene...

Homework Statement An airplane is flying 100m/s (N20E) according to the pilot, but is in a wind that is blowing 40 m/s (S10E). What is the plane's real velocity? Homework Equations Pythagorean Therom Cosin and Sin Laws Component Method The Attempt at a Solution Okay, I think I...

Homework Statement Sand moves without slipping at 6.0m/s down a conveyer belt that is tilted 15°. The sand enters a pipe 3.0m below the end of the conveyer belt. What is the horizontal distance between the conveyer belt and the pipe? Not sure where to start.

Homework Statement A projectile is shot from the edge of a vertical cliff 60.0meters above the ocean. It has a speed of 100m/s and is fired at an angle of 35 degrees above horizontal. How far from the foot of the vertical cliff does the projectile land. Homework Equations Yf= Yinitial + ViT...

Would the 2 items displayed in the image below act as I expect in a zero G environment? Assuming that item A had a mass of 100kg and was stationary, Items B have a mass of 1kg and travel at 10m/s. what formula would I need to use to calculate the velocities and vectors of the items after...

Homework Statement Sam Walks: 100m (S30W) + 200m (N30E) + 50m (N) Find sam's displacement using a diagram as well as mathematically.Homework Equations b(sq) = a(sq) + c(sq) - 2acCOSB a(sq) + b(sq) = c(sq) The Attempt at a Solution Okay I drew my graph, Scaled it 1cm = 50m So I first drew 100m...

Homework Statement I have been given the Horizontal Displacement (Distance), Vertical Displacement (height), and Time (secs). How would I find total displacement? Velocity? Average Horizontal Velocity? Average Vertical Velocity? Homework Equations Um something with cosine and sine...

2D Friction--Finding the Force of Friction without Mu Homework Statement A 1500kg car is parked on a 4-degree incline. The acceleration of gravity is 9.8 m/s2. Find the force of friction keeping the car from sliding down the incline.Homework Equations FW=mg [Sigma]Fy=0, so Top=Bottom "Friction...

Sorry if this is the wrong place to ask a question like this, but I am at wits end trying to make this system function properly while remaining computationally efficient. A summary of what I have so far: An iterative simulator that computes gravitational attration of objects on a cartesian...

I have a problem with this question. An arrow is shot horizontally towards point O, which is at a distance of 20.0 m. It hits point P (right below point O) 0.10 s later. What is the distance OP (in metres)? What do i need to find? How would i know the time taken for the arrow to reach o?

Homework Statement Ted Williams hits a baseball with an initial velocity of 120 miles per hour (176 ft/s) at an angle of θ = 35 degrees to the horizontal. The ball is struck 3 feet above home plate. You watch as the ball goes over the outfield wall 420 feet away and lands in the bleachers...

Homework Statement wiley e coyote is out once more to try to capture the elusive roadrunner. the coyote wears a pair of acme jet powered roller skates, which provide a constant horizontal acceleration ac. the coyote starts off at rest D meters from the edge of a cliff at the instant the...

Homework Statement Rectangular pipe, infinite in the z direction. The sides in the y-z plane (at x=0 and x=a) are held at V=0, while the sides in the x-z plane (at y=0 and y=b) are held at V=V0 Explain why there cannot be a non-trivial solution to this configuration. Homework...

Homework Statement A particle of mass m is placed on top of a vertical hoop of radius R and mass M. The particle is free slide on the outside of the hoop without friction while the hoop is free to roll in a vertical place without slipping. Use the method of Lagrange multipliers to determine...

A ball is tossed from an upper story window of a building. It has an initial velocity of 8.00 m/s at an angle of 20 degrees below the horizontal. How long does it take the ball to reach a point 10.0m below the level of launching. I tried using the equation yf=vi(sin(theta))-.5gt^2 Which I...

Homework Statement Draw the position of the atoms in the two neighboring planes of the GaAs crystal perpendicular to vector [010]. Find the type of the lattice and the basis of 2D crystal which is made by singling out those two neighboring layers from 3D lattice. Homework Equations...

A cargo plane is flying horizontally at an altitude of 10.9 km with a speed of 850 km/h when a large crate falls out of the rear loading ramp. (Ignore any effects due to air resistance.) (a) How long does it take the crate to hit the ground? (b)How far horizontally is the crate from the point...

1. While trying out for the position of pitcher on your high school baseball team, you throw a fastball at 76.4 mi/h toward home plate, which is 18.4 m away. How far does the ball drop due to effects of gravity by the time it reaches home plate? (Ignore any effects due to air resistance and...

I am sure this question has been asked many times before. I searched for a thread on this topic and could not find one. I am an artist. I am looking for an answer on the nature of sight. What is the best explanation for how sight occurs. Do we see a 3D world illuminated by 2D photons? Can we...

http://books.google.rs/books?id=vrcHC9XoHbsC&pg=PA252&lpg=PA252&dq=Nolting+Finite+Ising+lattice&source=bl&ots=5uRHp0iALf&sig=_YBUSvbCBbhNQJ5Zu1go9AsEkM8&hl=sr&sa=X&ei=y_E4UIEyyobiBPvFgMgM&ved=0CC0Q6AEwAA#v=onepage&q=Nolting%20Finite%20Ising%20lattice&f=false A finite lattice X with so...

Hello Forum, In kinematics we study motion and the trajectories of moving bodies. The trajectory is a line (straight or curved) that joins all the positions occupied by the object in the various instants of time. A trajectory has an equation that contains only spatial coordinates (not...

Hey everyone, I'm not sure if there is an effective answer to my problem, but here goes: I am working on Ramachandran plots for short peptides (3 amino acids long). For every snapshot of the protein (this would be my data point) there are two angles being recorded, the phi and psi angles...

Hi, Can anyone point me to a reference where the complete amplitude for a sunrise diagram in 2D with generally different masses is written down. That is, I want the value of the following integral $$ \int d^2k d^2l \frac{1}{(k^2-m_1^2)(l^2-m_2^2)((p-k-l)^2-m_3^2)} $$ where p is the...

Hello , i am trying to implement this algorithm for 2d grid. 1) i am not sure if my calculations are correct. 2 ) i don't understand how to return my final calculation ( how will i insert to the matrix i want (the 's' in this example) the new coordinates (xup,xdow,yup,ydown)). I mean ...

Homework Statement I will attach a scanned pic of the problem, but it seems to be a basic frames problem. However, everything seems to have to many unknowns on it to solve. I feel like I'm missing something simple, but I can't seem to make any more progress. Homework Equations ƩM=0...

Hello, I am a coder trying to build a game 2D rigid body physics engine. So far I am working with an impulse-based approach and all is going pretty decent. Everything does it's job, except one thing: friction acting on a rolling ball. First I will explain how my collision resolution system...

I'm making a 3D rotation of a poligon.The problem is when I rotate some points in 2D, it works, but if I use the same function to rotate the same points in a 3D perspective , while rotating the vertices move to the center of the object and remain there. I also wrote the 3D rendering part.At...

Here in the 3d world, we have 2d paper where we can draw 2d representations of 3d objects. How would a 2d being draw a representation of a 2d object on a line? Is that even possible?

Homework Statement I've just derived the 1D wave equation for a continuous 1D medium from a classical Hamiltonian. I simply wrote Hamilton's equations, where the derivatives here must be functional derivatives (e.g. δ/δu(x)) since p and u are functions of x, and I got the wave equation (see...

I have a character who needs to jump to a certain height, I want to calculate his initial vertical velocity so that he can achieve that height. Distances and speeds are in logical pixels per second. The character's position is stored in a 2D vector \begin{pmatrix} x \\ y\end{pmatrix}, and...

I'm studying the Milne Universe in two dimensions. The metric is similar to that of Rindler spacetime, but with time and space inverted. ds^{2}=-dt^{2}+t^{2}dx^{2} The Carter Penrose diagram of this spacetime would be the same of Rindler spacetime?

Hi, I am not very strong in maths, so sorry if these sounds simple. If I have a 3D geometry of a pipe which has its surface defined by triangles (such as that in Computational Fluid Dynamics or Finite Element Analysis) and I have the coordinate points for all the triangles, how can I...

Firstly, this is not homework - it's a project I have started our of sheer curiosity. I have searched quite at length, but cannot really find anything that suits my problem. I want to model this on a computer and would like to implement it myself as I would like to understand the...

Hello Im wondering how to calculate the acceleration of a circle down an inclined plane (due to gravity). I am familiar with caclulating the acceleration of a body sliding down a inclined plane, but not a circle. How do you determine the acceleration of a circle (preffer rotation per second, if...

Homework Statement Suppose you have two 2D circles, where size ≈ mass, each of which is moving with known x- and y-velocities. The two collide, not necessarily head-on (one could broadside the other, etc). How do I calculate the resultant velocities, assuming no elasticity or friction...

Hi ! I am working on a table tennis playing robot. The picture of the robot is attached. I have few questions. 1) Can I consider the collision between Ball and the plate as the two dimensional collision ? ? (At this time I am not considering z-axis) 2) If I am considering the...