The Fermi-Pasta-Ulam (FPU) problem is named after the numerical experiments first performed by Enrico Fermi, John Pasta, and Stanislaw Ulam in the summer of 1953 on the Los Alamos MANIAC computer, one of the first electronic computers. They wanted to understand how a one-dimensional crystal... Platforms: Mac, Mac OSX

Keyword: Assumed, Coupled, Cubic, Forces, Included, Initial, Interactions, Nonlinear, Quadratic, Quickly, Random, Springlike, System, Terms, Vibration

The EJS Ceiling Bounce Model shows a ball launched by a spring-gun in a building with a very high ceiling and a graph of the ball's position or velocity as a function of time. Students are asked set the ball's inital velocity so that it barely touches the ceiling. This simple model is a designed... Platforms: Mac, Mac OSX

Keyword: Access, Archive, Clicking, Compiled, Computer, Distributed, Double, Easier, Ejs Mecvh Newtion Ceilingbouncejar, Generate, Installed, Modeling, Models, Modify, Program, Readytorun, Simulations, Source, Version

The Circular Membrane Modes model displays the analytical wave equation solution for an ideal circular membrane with a fixed boundary. The solution is described by two integers m and n where n is a positive integer that counts the number of radial nodes and m counts the number of azimuthal... Platforms: Mac, Mac OSX

Keyword: Chladnilike, Circular, Counts, Created, Distributed, Ejs Mech Circularmembranemodesjar, Installed, Membrane, Model, Modeling, Modes, Nodal, Nodes, Number, Patternthe, Program, Simulations, Solution

The Ejs Duffing Attractor model computes the solutions to the non-linear Duffing equation, which reads, x'' + 2?zN* x' - x (1 - x2) = f cos(?Ya* t), where each prime denotes a time derivative. The simulation displays a three-dimensional plot of phase space versus angle and three Poincare plots... Platforms: Mac, Mac OSX

Keyword: Archive, Attractor, Clicking, Compiled, Created, Distributed, Double, Duffing, Ejs Ehu Chaos Duffing Attractorjar, Installed, Model, Models, Modify, Nonlinear, Physics, Popup, Simulation, Simulations, Source

The Ejs Coin Rolling with and without Sliding model displays the dynamics of an initially rotating, but not translating, coin subject to friction. The simulation displays the motion of the coin as well as the velocity vectors for the surface of the coin. The initial angular velocity and the... Platforms: Mac, Mac OSX

Keyword: Archive, Clicking, Compiled, Displays, Ejs Ehu Rigid Bodies Coinjar, Friction, Installed, Model, Models, Modify, Physics, Program, Project, Readytorun, Rolling, Simulation, Sliding, Source, Velocity

The QM Probability 2D program displays the time evolution of the two-dimensional probability density using color to represent its magnitude. The default wave function is a two-state superposition in the x (nx = 1,2) and y dimension (ny = 3,4) state in an infinite square well. Additional states... Platforms: Mac, Mac OSX

Keyword: Compiled, Distributed, Double, Eigenstate, Energy, Expansion, Found, Mechanics, Model, Physics, Probability, Program, Programs, Quantum, Readytorun, Searching, Source, Timedependent, Visualizations

This new version of the CCK adds capacitors, inductors and AC voltage sources to your toolbox! Now you can graph the current and voltage as a function of time. Main Topics * Circuits * Light Bulbs * Batteries * Switches * Ammeter * Voltmeter * Capacitor * Inductor * AC Voltage Platforms: Mac, Mac OS X v10.4

Keyword: Ammeter, Batteries, Bulbs, Capacitor, Capacitors, Circuits, Current, Function, Graph, Inductor, Inductors, Light, Sources, Switches, Timemain, Toolbox, Topics, Voltage, Voltmeter

The Ejs Simple Pendulum model displays the dynamics of a simple pendulum. The pendulum is initially displaced from equilibrium and the pendulum bob has zero initial velocity. The initial position of the pendulum bob can be changed by click-dragging the bob when the simulation is paused. You can... Platforms: Mac, Mac OSX

Keyword: Archive, Clicking, Designed, Double, Easier, Ejs Osc Pendulumjar, Generate, Initial, Installed, Model, Models, Modify, Pendulum, Physics, Program, Project, Simple, Simulation, Source

The Spherical Mirror Model demonstrates the focusing of light using a spherical mirror. The user can change the size and position of the object, the focal length of the mirror and the rays shown in the diagram. The Spherical Mirror Model was created using the Easy Java Simulations (EJS) modeling... Platforms: Mac, Mac OSX

Keyword: Archive, Clicking, Compiled, Distributed, Double, Ejs Spherical Mirrorjar, Focusing, Installed, Length, Light, Mirror, Model, Modeling, Program, Readytorun, Simulations, Spherical

ProtoCAD is a tool for creating circuit schematics rapidly. It is developed for use with stripboards but can also be used with other methods. The development of ProtoCAD was inspired by another tool called StripCAD which had the disadvantage that besides being closedsource, it was sadly not... Platforms: Mac, Mac OSX

Keyword: Circuit, Closedsource, Compatiblerunnable, Creating, Crossplatform, Developed, Disadvantage, Features, Lacked, Protocad, Rapidly, Sadly, Schematics, Stripcad, Wouldve