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Speed of light

Info on the speed of light, and how quickly it travels through water, air or diamond. Also contains a good overview of historical measurements of the speed of light.

http://www.olympusmicro.com/primer/lightandcolor/speedoflight.html

How laser speed guns work

A good explanation of how laser (LIDAR) speed guns are used to measure a car's speed. There are links to related questions.

http://auto.howstuffworks.com/car-driving-safety/safety-regulatory-devices/question396.htm

How Hypersonic Planes Work

A brief description of how Hypersonic Planes like the X-43A reach 10 times the speed of sound (mach 10). rom HowStuffWorks.com.

http://www.howstuffworks.com/hypersonic-plane.htm

Introduction to sound

The basics of sound waves, including really useful animations of how sound travels

http://www.fearofphysics.com/Sound/dist.html

Speed of Light

A basic site dealing with the speed and wavelength of electromagnetic waves.

http://www.colorado.edu/physics/2000/waves_particles/lightspeed-1.html

Sound Propagation

Good clear introduction to sound concepts with diagrams, including why you sound good singing in the shower!

http://arts.ucsc.edu/ems/music/tech_background/TE-01/teces_01.html

Air Track Simulator

This applet simulates collisions in one dimension. Users can change variables of mass, elasticity and initial speeds of masses on an air track.

http://www.msu.edu/user/brechtjo/physics/airTrack/airTrack.html

Newtonian Mountain

Shows cannonball projected off mountain. Different speeds produce different results. I particularly liked the "touch" when the ball completed an orbit and returned to where it left the mountain!