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How fast is 1.70 miles per second?

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It's about one-third as fast as The Space Shuttle.
In other words, 1.70 miles per second is 0.353310 times the speed of The Space Shuttle, and the speed of The Space Shuttle is 2.83040 times that amount.
(Orbiter vehicle velocity)
The space shuttle orbits at a speed of 4.81170 miles per second. 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 three times as fast as a Bullet (Rifle).
In other words, 1.70 miles per second is 2.990 times the speed of a Bullet (Rifle), and the speed of a Bullet (Rifle) is 0.3340 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 0.5690 miles per second. 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 four times as fast as a Jet Fighter.
In other words, 1.70 miles per second is 4.10 times the speed of a Jet Fighter, and the speed of a Jet Fighter is 0.240 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 0.410 miles per second. The F-16 has a flight ceiling of approximately 15 km (9.32 mi).
It's about seven times as fast as a Bullet (Handgun).
In other words, 1.70 miles per second is 7.120 times the speed of a Bullet (Handgun), and the speed of a Bullet (Handgun) is 0.140 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 0.2380 miles per second. This type of ammunition has been the standard issue round of the United States Federal Bureau of Investigation (FBI) since 1990.
It's about eight times as fast as The Speed of Sound.
In other words, 1.70 miles per second is 7.980 times the speed of The Speed of Sound, and the speed of The Speed of Sound is 0.1250 times that amount.
(in dry air at 20°C)
The speed of sound in dry air at 20°C (68°F) is 0.2130 miles per second. Air is a relatively poor acoustic conductor, however, as sound will travel at speeds of between 0.930 miles per second to 0.9690 miles per second in water, depending on its salinity.
It's about one-fifteenth as fast as a Meteor.
In other words, the speed of a Meteor is 15 times 1.70 miles per second.
(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 6.90 miles per second and 45 miles per second, depending on their size. The fireball effect, known as ablation, ceases once the atmosphere has slowed the meteoroid to a velocity of about 1.70 miles per second.
It's about thirty times as fast as a Peregrine Falcon.
In other words, 1.70 miles per second is 25.30 times the speed of a Peregrine Falcon, and the speed of a Peregrine Falcon is 0.0395 times that amount.
(a.k.a. Peregrine, a.k.a. Duck Hawk, Falco peregrinus)
The Peregrine Falcon can reach speeds of up to 0.0671 miles per second 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.