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How fast is 911 kilometers per hour?

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It's about 0.0000009 times as fast as The Speed of Light.
In other words, 911 kilometers per hour is 0.0000008441024740 times the speed of The Speed of Light, and the speed of The Speed of Light is 1,184,690.280 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 1,079,252,850 kilometers per hour, per the formal definition of the meter. While visible light travels close to this speed in air, it slows to 719,501,899 kilometers per hour when passing through the glass of a typical window.
It's about one-four-hundredth as fast as a bolt of Lightning.
In other words, 911 kilometers per hour is 0.0026 times the speed of a bolt of Lightning, and the speed of a bolt of Lightning is 380 times that amount.
(atmospheric electrical discharge)
A bolt of lightning can travel at up to 350,000 kph when arcing from the atmosphere to the Earth. An estimated 280 million lightning strikes strikes occur each year.
It's about one-one-hundred-fiftieth as fast as a Meteor.
In other words, the speed of a Meteor is 170 times 911 kilometers per hour.
(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 kph and 260,000 kph, 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 kph.
It's about one-thirtieth as fast as The Space Shuttle.
In other words, 911 kilometers per hour is 0.032679 times the speed of The Space Shuttle, and the speed of The Space Shuttle is 30.6010 times that amount.
(Orbiter vehicle velocity)
The space shuttle orbits at a speed of 27,877 kph. 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-tenths as fast as a Bullet (Rifle).
In other words, 911 kilometers per hour is 0.2770 times the speed of a Bullet (Rifle), and the speed of a Bullet (Rifle) is 3.610 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 3,294 kph. 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-fifths as fast as a Jet Fighter.
In other words, 911 kilometers per hour is 0.380 times the speed of a Jet Fighter, and the speed of a Jet Fighter is 2.60 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 kilometers per hour. The F-16 has a flight ceiling of approximately 15 km (9.32 mi).
It's about two-thirds as fast as a Bullet (Handgun).
In other words, 911 kilometers per hour is 0.6590 times the speed of a Bullet (Handgun), and the speed of a Bullet (Handgun) is 1.520 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 kph. This type of ammunition has been the standard issue round of the United States Federal Bureau of Investigation (FBI) since 1990.