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MIM-3 Nike on a launcher. Bell accepted the challenge, and Project Nike was officially formed on 8 February 1945. [8] The Bell team was given the task of attacking bombers flying at 500 mph (800 km/h) or more, [N 2] at altitudes between 20,000 and 60,000 feet (6,100 and 18,300 m), and performing a 3 g turn at 40,000 feet (12,000 m).
U.S. Federal Motor Vehicle Safety Standard 101, which governs vehicle controls and displays, permits speedometers to display miles per hour (MPH) or both MPH and km/h. [110] In practice, most U.S.-market vehicles have mile odometers and dual-labeled speedometers with miles-per-hour as the primary calibration.
On May 3, 1999, the highest wind speeds recorded on Earth at 321 mph (517 km/h) took place during the 1999 Bridge Creek–Moore tornado outbreak. The estimated costs were $1 billion (about $1.8 billion in 2024). This event was the first issued tornado emergency by the National Weather Service in history.
During the cyclone, several extreme gusts of greater than 83 m/s (300 km/h; 190 mph; 161 kn; 270 ft/s) were recorded, with a maximum 5-minute mean speed of 49 m/s (180 km/h; 110 mph; 95 kn; 160 ft/s); the extreme gust factor was on the order of 2.27–2.75 times the mean wind speed.