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How fast is 391 meters per hour?

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It's about one-one-thousandth as fast as a Peregrine Falcon.
In other words, 391 meters per hour is 0.00101 times the speed of a Peregrine Falcon, and the speed of a Peregrine Falcon is 990 times that amount.
(a.k.a. Peregrine, a.k.a. Duck Hawk, Falco peregrinus)
The Peregrine Falcon can reach speeds of up to 389,000 meters per hour when diving. Falcons are sometimes sent to scare smaller birds away from airports to improve air traffic safety and were used in World War II to intercept carrier pigeons used by enemy forces.
It's about one-three-thousandth as fast as The Speed of Sound.
In other words, 391 meters per hour is 0.000317 times the speed of The Speed of Sound, and the speed of The Speed of Sound is 3,150 times that amount.
(in dry air at 20°C)
The speed of sound in dry air at 20°C (68°F) is 1,230,000 meters per hour. Air is a relatively poor acoustic conductor, however, as sound will travel at speeds of between 5,390,000 meters per hour to 5,620,000 meters per hour in water, depending on its salinity.
It's about one-three-thousand-five-hundredth as fast as a Bullet (Handgun).
In other words, 391 meters per hour is 0.000283 times the speed of a Bullet (Handgun), and the speed of a Bullet (Handgun) is 3,530 times that amount.
(for .40 Smith & Wesson 135 grain Sierra JHP, VV 3N37 powder, Fed. 100 primer, Remington case) (muzzle velocity)
A 0.40 caliber Smith & Wesson bullet has a muzzle a velocity of 1,380,000 meters per hour. This type of ammunition has been the standard issue round of the United States Federal Bureau of Investigation (FBI) since 1990.
It's about one-six-thousandth as fast as a Jet Fighter.
In other words, 391 meters per hour is 0.00016 times the speed of a Jet Fighter, and the speed of a Jet Fighter is 6,300 times that amount.
(for Lockheed Martin F-16, a.k.a. Fighting Falcon, a.k.a. Viper) (maximum speed at altitude)
An F-16's maximum speed at altitude is approximately 2,400,000 meters per hour. The F-16 has a flight ceiling of approximately 15 km (9.32 mi).
It's about one-eight-thousand-five-hundredth as fast as a Bullet (Rifle).
In other words, 391 meters per hour is 0.000119 times the speed of a Bullet (Rifle), and the speed of a Bullet (Rifle) is 8,400 times that amount.
(5.56 x 45 mm, a.k.a. 5.56 NATO)
A 5.56 x 45 mm cartridge is fired at a velocity of 3,290,000 meters per hour. As the NATO rifle cartridge, it is used by the military forces of more than thirty-one countries, including use in the M16 series, M4 Carbine, HK-416, and M249 Squad automatic weapons used by the United States armed forces.
It's about one-seventy-thousandth as fast as The Space Shuttle.
In other words, 391 meters per hour is 0.000014026 times the speed of The Space Shuttle, and the speed of The Space Shuttle is 71,296 times that amount.
(Orbiter vehicle velocity)
The space shuttle orbits at a speed of 27,877,000 meters per hour. During liftoff, the space shuttle accelerates to orbital speed in 8.5 minutes, consuming over 1.59 million kg (3.51 million lbs) of propellant in the process.
It's about one-four-hundred-thousandth as fast as a Meteor.
In other words, 391 meters per hour is 0.0000026 times the speed of a Meteor, and the speed of a Meteor is 380,000 times that amount.
(formally Meteoroid or meteorite, depending on the context; a.k.a. "shooting star", a.k.a. "falling star")
Small meteoroids enter the Earth's atmosphere at speeds between 40,000,000 meters per hour and 260,000,000 meters per hour, depending on their size. The fireball effect, known as ablation, ceases once the atmosphere has slowed the meteoroid to a velocity of about 10,000,000 meters per hour.