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How fast is 347.90 yards per hour?

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It's about one-one-thousandth as fast as a Peregrine Falcon.
In other words, 347.90 yards per hour is 0.000818 times the speed of a Peregrine Falcon, and the speed of a Peregrine Falcon is 1,220 times that amount.
(a.k.a. Peregrine, a.k.a. Duck Hawk, Falco peregrinus)
The Peregrine Falcon can reach speeds of up to 425,000 yards 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-four-thousandth as fast as The Speed of Sound.
In other words, 347.90 yards per hour is 0.000258 times the speed of The Speed of Sound, and the speed of The Speed of Sound is 3,880 times that amount.
(in dry air at 20°C)
The speed of sound in dry air at 20°C (68°F) is 1,350,000 yards per hour. Air is a relatively poor acoustic conductor, however, as sound will travel at speeds of between 5,890,000 yards per hour to 6,140,000 yards per hour in water, depending on its salinity.
It's about one-four-thousand-five-hundredth as fast as a Bullet (Handgun).
In other words, the speed of a Bullet (Handgun) is 4,350 times 347.90 yards per hour.
(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 1,510,000 yards 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-seven-thousand-five-hundredth as fast as a Jet Fighter.
In other words, the speed of a Jet Fighter is 7,700 times 347.90 yards per hour.
(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 2,600,000 yards per hour. The F-16 has a flight ceiling of approximately 15 km (9.32 mi).
It's about one-ten-thousandth as fast as a Bullet (Rifle).
In other words, 347.90 yards per hour is 0.00009660 times the speed of a Bullet (Rifle), and the speed of a Bullet (Rifle) is 10,400 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 3,600,000 yards 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-ninety-thousandth as fast as The Space Shuttle.
In other words, 347.90 yards per hour is 0.0000114120 times the speed of The Space Shuttle, and the speed of The Space Shuttle is 87,627 times that amount.
(Orbiter vehicle velocity)
The space shuttle orbits at a speed of 30,487,000 yards 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-five-hundred-thousandth as fast as a Meteor.
In other words, 347.90 yards per hour is 0.00000210 times the speed of a Meteor, and the speed of a Meteor is 480,000 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 44,000,000 yards per hour and 280,000,000 yards 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 11,000,000 yards per hour.