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  2. 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.

  3. Sabah - Wikipedia

    en.wikipedia.org/wiki/Sabah

    The total land area of Sabah is nearly 73,904 square kilometres (28,534 sq mi) [199] surrounded by the South China Sea in the west, Sulu Sea in the northeast and Celebes Sea in the southeast. [2] Sabah has a total of 1,743 kilometres (1,083 mi) coastline, of which 295.5 kilometres (183.6 mi) have been eroding . [ 200 ]

  4. Feddan - Wikipedia

    en.wikipedia.org/wiki/Feddan

    1 feddan = 24 kirat = 60 metre × 70 metre = 4200 [2] square metres (m 2) = 0.420 hectares = 1.037 acres [3] In Syria , the feddan is a vaguer quantity, referring to the amount of land that can be ploughed by a pair of oxen in a year, being about 5–12 ha (12–30 acres).

  5. Soil consolidation - Wikipedia

    en.wikipedia.org/wiki/Soil_consolidation

    The first modern theoretical models for soil consolidation were proposed in the 1920s by Terzaghi and Fillunger, according to two substantially different approaches. [1] The former was based on diffusion equations in eulerian notation, whereas the latter considered the local Newton’s law for both liquid and solid phases, in which main variables, such as partial pressure, porosity, local ...

  6. Hectare - Wikipedia

    en.wikipedia.org/wiki/Hectare

    Image comparing the hectare (the small blue area at lower left) to other units. The entire yellow square is one square mile.. The hectare (/ ˈ h ɛ k t ɛər,-t ɑːr /; SI symbol: ha) is a non-SI metric unit of area equal to a square with 100-metre sides (1 hm 2), that is, 10,000 square metres (10,000 m 2), and is primarily used in the measurement of land.

  7. Field capacity - Wikipedia

    en.wikipedia.org/wiki/Field_capacity

    Field capacity is the amount of soil moisture or water content held in the soil after excess water has drained away and the rate of downward movement has decreased. This usually occurs two to three days after rain or irrigation in pervious soils of uniform structure and texture.

  8. Basal area - Wikipedia

    en.wikipedia.org/wiki/Basal_area

    It is a common way to describe stand density. In forest management, basal area usually refers to merchantable timber and is given on a per hectare or per acre basis. If one cut down all the merchantable trees on an acre at 4.5 feet (1.4 m) off the ground and measured the square inches on the top of each stump (πr*r), added them all together ...

  9. Soil gradation - Wikipedia

    en.wikipedia.org/wiki/Soil_Gradation

    Soil gradation is a classification of the particle size distribution of a soil. Coarse-grained soils, mainly gravels or sands, are graded as either well graded or poorly graded.