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"speed of sound"
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Details of the experiment conducted to determine the speed of light including Ole Römer's observation with an eclipse of Io, Jupiter's moon.
Experimental measurements of the speed of light have been refined in progressively more accurate experiments since the seventeenth century.
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!
A short cartoon explaining how the speed of light is measured
How the new roof at Wimbledon affects tennis ball speeds.
The cross-country navigation of an aircraft involves the vector addition of relative velocities since the resultant ground speed is the vector sum of the airspeed and the wind speed.
The speed distribution for the molecules of an ideal gas is given by Maxwell's speed distribution
Shows a simulation for crossing a river in a boat. Speed of river, boat angle and speed can be changed.
Page explaining speed and velocity, and the difference between the two.
A good site on how animals such as bats or dolphins see with sound (also known as echolocation ).
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