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For radar (e.g. for wavelengths 300 to 3 mm i.e. frequencies between 1 and 100 GHz) the radius of the Earth may be multiplied by 4/3 to obtain an effective radius giving a factor of 4.12 in the metric formula i.e. the radar horizon will be 15% beyond the geometrical horizon or 7% beyond the visual. The 4/3 factor is not exact, as in the visual ...
Visibility of less than 100 metres (330 ft) is usually reported as zero. In these conditions, roads may be closed, or automatic warning lights and signs may be activated to warn drivers. These have been put in place in certain areas that are subject to repeatedly low visibility, particularly after traffic collisions or pile-ups involving ...
Square miles should not be confused with miles square, a square region with each side having a length of the value given. For example, a region which is 20 miles square (20 miles × 20 miles) has an area of 400 sq mi; a rectangle of measuring 10 miles × 40 miles also has an area of 400 sq mi, but is not 20 miles square.
Depth perception is the ability to perceive distance to objects in the world using the visual system and visual perception. It is a major factor in perceiving the world in three dimensions . Depth sensation is the corresponding term for non-human animals, since although it is known that they can sense the distance of an object, it is not known ...
A solo hiker bounced from rocks as he fell 100 feet from a cliff into an icy lake in Washington, deputies said. The injured man sent an SOS signal Sunday, Dec. 8, from Lake Serene, the Snohomish ...
Not far away in Jamestown, North Carolina, Furnitureland South, which bills itself as the world's largest furniture store, has a facade featuring an 85-foot-tall highboy dresser, but without socks ...
The Dutch kleine mile had the historical definition of one hour's walking (uur gaans), which was defined as 24 stadia, 3000 paces, or 15,000 Amsterdam or Rhineland feet (respectively 4,250 m or 4,710 m). The common Dutch mile was 32 stadia, 4,000 paces, or 20,000 feet (5,660 m or 6,280 m). The large mile was defined as 5000 paces. [41]
200 FEET ABOVE THE MERCEDES-BENZ STADIUM FIELD, ATLANTA — Freddie the Falcon, the Atlanta Falcons’ feathery, daredevil mascot, paces around the narrow catwalk high above the east end zone of ...