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The speed of light is 1.8026 × 10 12 furlongs per fortnight (1.8026 terafurlongs per fortnight). By mass–energy equivalence, 1 firkin is equal to 3.249 366 76 × 10 24 firkin· furlong 2 / fortnight 2 (≈ 3.478 × 10 15 BTU, or 3.669 × 10 18 joules).
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.
Besides having the meaning of "any obscure unit", furlongs per fortnight have also served frequently in the classroom as an example on how to reduce a unit's fraction. The speed of light may be expressed as being roughly 1.8 terafurlongs per fortnight (or megafurlongs per microfortnight). [2]
mile per hour: mph ≡ 1 mi/h = 0.447 04 m/s: mile per minute: mpm ≡ 1 mi/min = 26.8224 m/s: mile per second: mps ≡ 1 mi/s = 1 609.344 m/s: speed of light in vacuum: c: ≡ 299 792 458 m/s = 299 792 458 m/s: speed of sound in air: s: 1225 to 1062 km/h (761–660 mph or 661–574 kn) [note 1] ≈ 340 to 295 m/s: Note
Among the important units of distance and length at the time were the foot, yard, rod (or pole), furlong, and the mile. The rod was defined as 5 + 1 ⁄ 2 yards or 16 + 1 ⁄ 2 feet, and the mile was eight furlongs, so the definition of the furlong became 40 rods and that of the mile became 5,280 feet (eight furlongs/mile times 40 rods/furlong ...
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Foot per second; Furlongs per fortnight; I. Inch per second; K. Kilometres per hour; Knot (unit) M. Metre per hour; Metre per second; Miles per hour; O. Orders of ...
Feet per second: furlong per fortnight ~furlong per fortnight: 1.397/8,400: furlong per fortnight: furlongs per fortnight: km/h mph: FFF system: in/h: in/h: 0.0254/60/60: inch per hour: inches per hour: cm/h: Inch: in/s: in/s: 0.0254: inch per second: inches per second: cm/s: Inch: in/year: in/year: 0.0254/365.2425/24/60/60: inch per year ...