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"speed of sound"
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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.
A good explanation of how laser (LIDAR) speed guns are used to measure a car's speed. There are links to related questions.
A brief description of how Hypersonic Planes like the X-43A reach 10 times the speed of sound (mach 10). rom HowStuffWorks.com.
The basics of sound waves, including really useful animations of how sound travels
A basic site dealing with the speed and wavelength of electromagnetic waves.
Good clear introduction to sound concepts with diagrams, including why you sound good singing in the shower!
This applet simulates collisions in one dimension. Users can change variables of mass, elasticity and initial speeds of masses on an air track.
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!
Experimental measurements of the speed of light have been refined in progressively more accurate experiments since the seventeenth century.
A short cartoon explaining how the speed of light is measured
Showing 21 - 30 of 165