Speed
From Wikinfo
Speed is the rate of motion expressed as distance moved per unit of time. Speed is a scalar quantity; the equivalent vector quantity is known as velocity.
Units of speed include:
- meter per second, (symbol m/sec), the SI derived unit
- kilometer per hour, (symbol km/h or kph)
- mile per hour, (symbol mph)
- knot (nautical miles per hour)
- Mach, where Mach 1 is the speed of sound; Mach n is n times as fast.
- 1 m/sec = 3.6 km/h
- 1 mph = 1.609 km/h
- 1 knot = 1.852 km/h = 0.514 m/sec
- Mach 1 = about 1200 km/h = about 330 m/sec
Speed is also:
- A slang term for amphetamines
- An American film: see Speed (movie)
References
- Adapted from the Wikipedia article, "Speed" http://en.wikipedia.org/wiki/Speed, used under the GNU Free Documentation License
