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For example, for visible light, the refractive index of glass is typically around 1.5, meaning that light in glass travels at c / 1.5 ≈ 200 000 km/s (124 000 mi/s); the refractive index of air for visible light is about 1.0003, so the speed of light in air is about 90 km/s (56 mi/s) slower than c.
2004 FU 162 is an Aten near-Earth asteroid less than 20 meters in diameter crudely estimated to have passed roughly 6500 km above the surface of Earth [b] on 31 March 2004.. It was only observed for 44 minutes on 31 March 2004, [a] by the Lincoln Near-Earth Asteroid Research (LINEAR) team at Lincoln Laboratory's Experimental Test Site in Socorro, New Mexico, and remains a lost asteroid. [2]
an object of diameter 725.27 km at a distance of one astronomical unit, an object of diameter 45 866 916 km at one light-year, an object of diameter one astronomical unit (149 597 870.7 km) at a distance of one parsec, per the definition of the latter. [7]
This was followed shortly after by the day's first severe thunderstorm watch, issued for primarily eastern Nebraska in response to a developing line of supercells. [ 15 ] [ 16 ] An hour later, the SPC upgraded some areas previously under a slight risk for severe weather to a moderate risk as a result of continuously increasing moisture content ...
Revolutions per minute (abbreviated rpm, RPM, rev/min, r/min, or r⋅min −1) is a unit of rotational speed (or rotational frequency) for rotating machines. One revolution per minute is equivalent to 1 / 60 hertz .
109.4–120.7 km/h (68.0–75.0 mph) [d] The cheetah can accelerate from 0 to 96.6 km/h (60.0 mph) in under three seconds, [58] though endurance is limited: most cheetahs run for only 60 seconds at a time. [19] When sprinting, cheetahs spend more time in the air than on the ground. [59] See Sarah, the fastest cheetah.
Tropical Storm Helene was a weak tropical storm which affected the southern Caribbean and Central America in mid-August 2012. The seventh tropical depression and eighth named storm of the 2012 Atlantic hurricane season, [nb 1] Helene was monitored as a tropical wave that exited the west coast of the African continent on August 5.
In 2019, Wizz Air stated a 57 g/RPK CO₂ emissions (equivalent to 18.1 g/km of fuel, 2.27 L/100 km [104 mpg ‑US] per passenger), 40% lower than IAG or Lufthansa (95 g CO₂/RPK - 30 g/km of fuel, 3.8 L/100 km [62 mpg ‑US] per passenger), due to their business classes, lower-density seating, and flight connections.