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How fast is 4.52 mach?

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It's about one-and-two-thirds times as fast as a Bullet (Rifle).
In other words, the speed of a Bullet (Rifle) is 0.61 times 4.52 mach.
(5.56 x 45 mm, a.k.a. 5.56 NATO)
A 5.56 x 45 mm cartridge is fired at a velocity of 2.76 mach. 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 two times as fast as a Jet Fighter.
In other words, 4.52 mach is 2.2 times the speed of a Jet Fighter, and the speed of a Jet Fighter is 0.45 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 Mach 2. The F-16 has a flight ceiling of approximately 15 km (9.32 mi).
It's about four times as fast as a Bullet (Handgun).
In other words, 4.52 mach is 3.9 times the speed of a Bullet (Handgun), and the speed of a Bullet (Handgun) is 0.256 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 1.16 mach. This type of ammunition has been the standard issue round of the United States Federal Bureau of Investigation (FBI) since 1990.
It's about four-and-a-half times as fast as The Speed of Sound.
In other words, 4.52 mach is 4.37 times the speed of The Speed of Sound, and the speed of The Speed of Sound is 0.229 times that amount.
(in dry air at 20°C)
The speed of sound in dry air at 20°C (68°F) is 1.03 mach. Air is a relatively poor acoustic conductor, however, as sound will travel at speeds of between 4.52 mach to 4.71 mach in water, depending on its salinity.
It's about one-fifth as fast as The Space Shuttle.
In other words, 4.52 mach is 0.19353 times the speed of The Space Shuttle, and the speed of The Space Shuttle is 5.1672 times that amount.
(Orbiter vehicle velocity)
The space shuttle orbits at a speed of 23.356 mach. 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 fourteen times as fast as a Peregrine Falcon.
In other words, 4.52 mach is 13.9 times the speed of a Peregrine Falcon, and the speed of a Peregrine Falcon is 0.0719 times that amount.
(a.k.a. Peregrine, a.k.a. Duck Hawk, Falco peregrinus)
The Peregrine Falcon can reach speeds of up to 0.326 mach 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 fifteen times as fast as The CRH (train).
In other words, the speed of The CRH (train) is 0.067 times 4.52 mach.
(a.k.a. Hexie Hao, 和谐号, a.k.a. 和諧號, a.k.a. Héxié Hào, a.k.a. "Harmony")
The CRH-3 train which runs on China's Beijing-Tianjin Intercity Railway are capable of speeds up to 0.29 mach. Theses train can make the 120 km (74 mi) journey from Beijing to Tianjin in about 30 minutes.