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Equivalents in other units


How fast is 391 meters per hour?

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It's about 0.0000000004 times as fast as The Speed of Light.
In other words, 391 meters per hour is 0.00000000036228767 times the speed of The Speed of Light, and the speed of The Speed of Light is 2,760,237,470 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 1,079,252,850,000 meters per hour, per the formal definition of the meter. While visible light travels close to this speed in air, it slows to 719,501,899,000 meters per hour when passing through the glass of a typical window.
It's about one-nine-hundred-thousandth as fast as a bolt of Lightning.
In other words, 391 meters per hour is 0.0000011 times the speed of a bolt of Lightning, and the speed of a bolt of Lightning is 910,000 times that amount.
(atmospheric electrical discharge)
A bolt of lightning can travel at up to 350,000,000 meters per hour when arcing from the atmosphere to the Earth. An estimated 280 million lightning strikes strikes occur each year.
It's about one-four-hundred-thousandth as fast as a Meteor.
In other words, 391 meters per hour is 0.0000026 times the speed of a Meteor, and the speed of a Meteor is 380,000 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 40,000,000 meters per hour and 260,000,000 meters 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 10,000,000 meters per hour.
It's about one-seventy-thousandth as fast as The Space Shuttle.
In other words, 391 meters per hour is 0.000014026 times the speed of The Space Shuttle, and the speed of The Space Shuttle is 71,296 times that amount.
(Orbiter vehicle velocity)
The space shuttle orbits at a speed of 27,877,000 meters 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-eight-thousand-five-hundredth as fast as a Bullet (Rifle).
In other words, 391 meters per hour is 0.000119 times the speed of a Bullet (Rifle), and the speed of a Bullet (Rifle) is 8,400 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 3,290,000 meters 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-six-thousandth as fast as a Jet Fighter.
In other words, 391 meters per hour is 0.00016 times the speed of a Jet Fighter, and the speed of a Jet Fighter is 6,300 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 2,400,000 meters per hour. The F-16 has a flight ceiling of approximately 15 km (9.32 mi).
It's about one-three-thousand-five-hundredth as fast as a Bullet (Handgun).
In other words, 391 meters per hour is 0.000283 times the speed of a Bullet (Handgun), and the speed of a Bullet (Handgun) is 3,530 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 1,380,000 meters per hour. This type of ammunition has been the standard issue round of the United States Federal Bureau of Investigation (FBI) since 1990.