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Speed; system unit code (alternative) symbol or abbrev. notes sample default conversion combinations SI: metre per second: m/s m/s US spelling: meter per second 1.0 m/s (3.3 ft/s)
The knot (/ n ɒ t /) is a unit of speed equal to one nautical mile per hour, exactly 1.852 km/h (approximately 1.151 mph or 0.514 m/s). [1] [2] The ISO standard symbol for the knot is kn. [3]
≡ 4 Callippic cycles - 1 d = 9.593 424 Gs: hour: h ≡ 60 min = 3.6 ks [note 3] jiffy: j ≡ 1 ⁄ 60 s = 16. 6 ms jiffy (alternative) ja ≡ 1 ⁄ 100 s = 10 ms kè (quarter of an hour) ≡ 1 ⁄ 4 h = 1 ⁄ 96 d = 15 min = 900 s kè (traditional) ≡ 1 ⁄ 100 d = 14.4 min = 864 s lustre; lūstrum: ≡ 5 a of 365 d [note 4] = 157.68 Ms ...
The switches may be arranged so that they are in the same orientation for off, and contrasting orientations for on. [1] A "4-way" (intermediate) switch is a purpose built double pole, double throw (DPDT) switch, internally wired in manufacture to reverse the connections between the input and output and having only four external terminals. This ...
Some airspeed indicators in aircraft prior to the mid-1970s indicate in miles per hour plus knots (1 knot = 1.15 mph) or kilometers per hour (1 knot = 1.85 km/h). A primary flight display with the indicated airspeed (IAS) displayed in the form of a vertical "tape" on the left.
Switches were passed over at a speed of 560 km/h (348 mph) (straight) during the French world speed run of April 2007. [9] The US Federal Railroad Administration has published the speed limits for higher-speed turnouts with No. 26.5 turnout that has speed limit of 60 mph (97 km/h) and No. 32.7 with speed limit of 80 mph (129 km/h). [10]
where a 0 is 1,225 km/h (661.45 kn) (the standard speed of sound at 15 °C), M is the Mach number, P is static pressure, and P 0 is standard sea level pressure (1013.25 hPa). Combining the above with the expression for Mach number gives EAS as a function of impact pressure and static pressure (valid for subsonic flow):
The Strowger switch is the first commercially successful electromechanical stepping switch telephone exchange system. It was developed by the Strowger Automatic Telephone Exchange Company founded in 1891 by Almon Brown Strowger .