Animation of a sonic boom (wave model)

This animation shows the waves propagating from an aircraft moving at speeds greater than the speed of sound. An audible boom is heard when the edge of the wavefront reaches the man's ears. The velocity shown is with respect to the speed of sound. The animation begins with velocity=2 which means the aircraft is moving at twice the speed of sound.

The velocity may be changed by typing in a number (including decimal points if desired) at the keyboard, followed by pressing the enter key. When the value is completely entered, the value shown on the screen will change to the new value.

The program recognizes the following commands.
stop Stop animation. Press stop again to resume animation.
start Start animation again with aircraft at left edge of screen.