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How fast is 581 mach?

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It's about one-one-thousand-five-hundredth as fast as The Speed of Light.
In other words, 581 mach is 0.000642552791 times the speed of The Speed of Light, and the speed of The Speed of Light is 1,556.29236 times that amount.
(C) (in a vacuum)
The speed of light (and all other electromagnetic radiation) in a perfect vacuum is known as "c" and measures exactly 904,205.862 mach, per the formal definition of the meter. While visible light travels close to this speed in air, it slows to 602,803.908 mach when passing through the glass of a typical window.
It's about two times as fast as a bolt of Lightning.
In other words, the speed of a bolt of Lightning is 0.5 times 581 mach.
(atmospheric electrical discharge)
A bolt of lightning can travel at up to 290 mach when arcing from the atmosphere to the Earth. An estimated 280 million lightning strikes strikes occur each year.
It's about four-and-a-half times as fast as a Meteor.
In other words, the speed of a Meteor is 0.22 times 581 mach.
(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 34 mach and 220 mach, depending on their size. The fireball effect, known as ablation, ceases once the atmosphere has slowed the meteoroid to a velocity of about 8.4 mach.
It's about twenty times as fast as The Space Shuttle.
In other words, 581 mach is 24.876 times the speed of The Space Shuttle, and the speed of The Space Shuttle is 0.040199 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 200 times as fast as a Bullet (Rifle).
In other words, 581 mach is 211 times the speed of a Bullet (Rifle), and the speed of a Bullet (Rifle) is 0.00474 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 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 300 times as fast as a Jet Fighter.
In other words, 581 mach is 290 times the speed of a Jet Fighter, and the speed of a Jet Fighter is 0.0034 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 500 times as fast as a Bullet (Handgun).
In other words, 581 mach is 502 times the speed of a Bullet (Handgun), and the speed of a Bullet (Handgun) is 0.00199 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.