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  2. Knot (unit) - Wikipedia

    en.wikipedia.org/wiki/Knot_(unit)

    1.68781 feet per second (approximately). The length of the internationally agreed nautical mile is 1 852 m . The US adopted the international definition in 1954, having previously used the US nautical mile ( 1 853 .248 m ). [ 6 ]

  3. Square yard - Wikipedia

    en.wikipedia.org/wiki/Square_yard

    It is defined as the area of a square with sides of one yard (three feet, thirty-six inches, 0.9144 metres) ... ≈0.000000322830579 square miles; ... 1.00969 gaj [1]

  4. Equations for a falling body - Wikipedia

    en.wikipedia.org/wiki/Equations_for_a_falling_body

    The first equation shows that, after one second, an object will have fallen a distance of 1/2 × 9.8 × 1 2 = 4.9 m. After two seconds it will have fallen 1/2 × 9.8 × 2 2 = 19.6 m; and so on. On the other hand, the penultimate equation becomes grossly inaccurate at great distances.

  5. Naismith's rule - Wikipedia

    en.wikipedia.org/wiki/Naismith's_rule

    The original Naismith's rule from 1892 says that one should allow one hour per three miles on the map and an additional hour per 2000 feet of ascent. [1] [4] It is included in the last sentence of his report from a trip. [1] [8] Today it is formulated in many ways. Naismith's 1 h / 3 mi + 1 h / 2000 ft can be replaced by:

  6. Orders of magnitude (speed) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(speed)

    The top speed of a sloth. 10 −1: 0.2778: 1: 0.6214: 9.2657 × 10 −10: 1 km/h. 0.44704: 1.609344: 1: 1.4912 × 10 −9: 1 mph. 0.5144: 1.852: 1.151: 1.716 × 10 −9: 1 knot (nautical mile per hour) 10 0: 1.2: 4.32: 2.68: 4 × 10 −9: Typical scanning speed of an audio compact disc; the speed of signals (action potentials) traveling along ...

  7. Rule of three (aeronautics) - Wikipedia

    en.wikipedia.org/wiki/Rule_of_three_(aeronautics)

    In aviation, the rule of three or "3:1 rule of descent" is a rule of thumb that 3 nautical miles (5.6 km) of travel should be allowed for every 1,000 feet (300 m) of descent. [ 1 ] [ 2 ] For example, a descent from flight level 350 would require approximately 35x3=105 nautical miles.

  8. Guz - Wikipedia

    en.wikipedia.org/wiki/Guz

    By 1875, the average value of the guz in Bengal was 36 inches (1.0 yd; 910 mm), but was 33 inches (840 mm) in Madras and 27 inches (690 mm) in Bombay. [ 1 ] [ 2 ] By the 20th century, the guz was uniformly quoted as being equal in length to one yard in the English system , or 0.91 metres in the metric system . [ 3 ]

  9. Gravitational acceleration - Wikipedia

    en.wikipedia.org/wiki/Gravitational_acceleration

    Using the integral form of Gauss's Law, this formula can be extended to any pair of objects of which one is far more massive than the other — like a planet relative to any man-scale artifact. The distances between planets and between the planets and the Sun are (by many orders of magnitude) larger than the sizes of the sun and the planets.