Compadre

The Momentum Space package is a self-contained file for the teaching of the time evolution and visualization of energy eigenstates and their superpositions via momentum space in quantum mechanics. The file contains ready-to-run OSP programs and a set of curricular materials. The material focuses... Platforms: Mac

The STP Entropy Einstein Solid program calculates the entropy of two Einstein solids that can exchange energy. The purpose of this calculation is to illustrate that the entropy is a maximum at thermal equilibrium. The default system is two Einstein solids with 50 particles each and total energy E... Platforms: Mac

The Ejs Pendulum on an Accelerating Train model displays the model of a pendulum on an accelerating train. The problem assumes that the pendulum rod is rigid and massless and of length, L = 2, and the pendulum bob is of mass, m = 1. The initial pendulum angle and the initial velocity of the train... Platforms: Mac

The STP IdealQuantumGas program is a simulation of an ideal quantum gas in equilibrium with a heat bath. The program computes the density of states, particle distribution function, and energy occupancy diagram. The default system is a three-dimensional ideal Fermi gas of N=100 particles at... Platforms: Mac

The STP IdealFermiGasIntegral program numerically determines the value of the chemical potential of an ideal Fermi gas for a given temperature and density. STP IdealFermiGasIntegral is part of a suite of Open Source Physics programs that model aspects of Statistical and Thermal Physics (STP).... Platforms: Mac

The STP ChemicalDemon program displays a histogram of the energy of a demon that exchanges energy and particles with a one-dimensional lattice of particles. The purpose of this simulation is to understand how the demon acts as an ideal thermometer and ideal measurement of the chemical potential.... Platforms: Mac

The GR Kerr Exploding program simulates orbits of objects released in an explosion in the equatorial plane of a rotating black hole using the Kerr metric. It is distributed as a ready-to-run (compiled) Java archive. Double clicking the gr_kerr_exploding.jar file will run the program if Java is... Platforms: Mac

The GR Seeing program The GR Seeing program simulates the path of light around a black hole using the Schwarzschild metric. It also shows a plot of the proper time and angle the light is observed by a shell observer in order to demonstrate what a shell observer would see when looking at light... Platforms: Mac

The STP Percolation program generates occupied lattice sites with probability p and then determines the clusters of occupied sites. The purpose of this program is to demonstrate some of the important properties of percolation, especially near the geometrical phase transition. The default system... Platforms: Matlab

The Tracker Sampler Package contains several video analysis and modeling experiments from mechanics to spectroscopy. It is distributed as a ready-to-run (compiled) Java archive containing Tracker (video analysis and modeling tool), movies, and some initial analysis. Double clicking the... Platforms: Mac

The Tracker Air Resistance Model asks students to explore air resistance of falling coffee cups by considering both viscous (linear) and drag (quadratic) models. Students see a video of falling cups and explore dynamical models that are overlayed on the video. It is distributed as a ready-to-run... Platforms: Mac

The QM Momentum Carpet program displays the time evolution of the position-space wave function and the associated quantum-mechanical momentum-time diagram, the momentum-space quantum carpet. The default wave function is a Gaussian wave packet in an infinite square well. Additional states and... Platforms: Mac

The EJSMagnetic Field from Loops model computes the B-field created by an electric current through a straight wire, a closed loop, and a solenoid. Users can adjust the vertical position of the slice through the 3D field. The Magnetic Field from Loops model was created using the Easy Java... Platforms: Mac

The EJS Cellular Automata Rules Model shows a spatial lattice which can have any one of a finite number of states and which are updated synchronously in discrete time steps according to a local (nearby neighbor) rule. You can change the lattice size, pick different rules (0 to 255 as classified... Platforms: Mac

The Lagrangian Pendulum Spring model asks students to solve the Lagrangian for a spring-pendulum and then develop a model of it. It is distributed as a ready-to-run (compiled) Java archive. Double-clicking the ejs_CM_Lagrangian_pendulum_spring.jar file will run the program if Java is installed.... Platforms: Mac

The EJS Lennard-Jones Potential model shows the dynamics of a particle of mass m within this potential. You can drag particle to change its position and you can drag the energy-line to change its total energy. The Lennard-Jones potential function is a reasonably accurate model of interactions... Platforms: Mac

The Ejs Wave Function Plotter model displays a one-dimensional wave function u(x,t) depicting a disturbance at position x and time t. The disturbance can be mass density, pressure, or electric field depending on the physical context. The default wave function is sinusoidal but any other analytic... Platforms: Mac

The Complex Function Plot program displays a user-defined complex function of position and time using representations that map phase into color. The default complex function is a time-dependent complex Gaussian and the representation can be changed by selecting a radio button. Additional... Platforms: Mac

The Ejs Hard Sphere Gas model displays a three-dimensional (ideal) gas made out of hard disks. Particles are initialized with a random speed and in a random direction and move with constant velocity until a collision occurs. You can modify this simulation if you have Ejs installed by... Platforms: Mac

The QM Superposition Launcher package is a self-contained file for the teaching of the time evolution and visualization of energy eigenstates and their superpositions in quantum mechanics. The file contains ready-to-run OSP programs and curricular materials. One can choose from several real-time... Platforms: Mac