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1 nautical mile per hour (by definition), 1 852.000 metres per hour (exactly), [5] 0.51444 metres per second (approximately), 1.15078 miles per hour (approximately), 20.25372 inches per second (approximately) 1.68781 feet per second (approximately). The length of the internationally agreed nautical mile is 1 852 m.
One mickey is the smallest resolvable unit of distance by a given computer mouse pointing device. It is named after Walt Disney's Mickey Mouse cartoon character. [13] Mouse motion is reported in horizontal and vertical mickeys. Device sensitivity is usually specified in mickeys per inch.
Most United States Navy ships of the post–World War II era have actually carried 2 or 3 bells: the larger bell engraved with the ship's name, mounted on the forecastle, and smaller bells in the pilot house and at the quarterdeck at the 1MC (public address) station, for use in making shipwide announcements and marking the time. The larger bell ...
The speed of sound is the distance travelled per unit of time by a sound wave as it propagates through an elastic medium. More simply, the speed of sound is how fast vibrations travel. At 20 °C (68 °F), the speed of sound in air, is about 343 m/s (1,125 ft/s; 1,235 km/h; 767 mph; 667 kn), or 1 km in 2.91 s or one mile in 4.69 s.
A basic airspeed indicator with the indicated airspeed (IAS) indicated in knots ("Kt" or "Kts" or "KIAS") -- the most common unit of measure for airspeed. 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).
The sensitivity of a microphone is usually expressed as the sound field strength in decibels (dB) relative to 1 V/Pa (Pa = N/m 2) or as the transfer factor in millivolts per pascal (mV/Pa) into an open circuit or into a 1 kiloohm load. [citation needed] The sensitivity of a hydrophone is usually expressed as dB relative to 1 V/μPa. [7]
A chip log, also called common log, [1] ship log, or just log, is a navigation tool mariners use to estimate the speed of a vessel through water. The word knot , to mean nautical mile per hour , derives from this measurement method.
Signals propagate at the speed of sound in the medium (almost always water), and maximum PRF depends upon the size of the object being examined. For example, the speed of sound in water is 1,497 m/s, and the human body is about 0.5 m thick, so the PRF for ultrasound images of the human body should be less than about 2 kHz (1,497/0.5).