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How fast is 139 inches per second?

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It's about 55 times as fast as a Sloth
In other words, 139 inches per second is 53 times the speed of a Sloth, and the speed of a Sloth is 0.02 times that amount.
(for Brown-throated three-toed sloth, Bradypus variegatus)
The three-toed sloth moves along the ground at an average speed of 2.60 inches per second. Long thought to be lengthy sleepers, a 2008 study concluded that sloths sleep an average of only 9.6 hours per day.
It's about one-ninety-fifth as fast as The Speed of Sound
In other words, 139 inches per second is 0.010 times the speed of The Speed of Sound, and the speed of The Speed of Sound is 97.1 times that amount.
(in dry air at 20°C)
The speed of sound in dry air at 20°C (68°F) is 13,500 inches per second. Air is a relatively poor acoustic conductor, however, as sound will travel at speeds of between 58,900 inches per second to 61,400 inches per second in water, depending on its salinity.
It's about one-one-hundredth as fast as a Bullet (Handgun)
In other words, 139 inches per second is 0.0092 times the speed of a Bullet (Handgun), and the speed of a Bullet (Handgun) is 109 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 15,100 inches 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 one-two-hundredth as fast as a Jet Fighter
In other words, 139 inches per second is 0.005 times the speed of a Jet Fighter, and the speed of a Jet Fighter is 190 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 26,000 inches per second. The F-16 has a flight ceiling of approximately 15 km (9.32 mi).
It's about one-two-hundred-fiftieth as fast as a Bullet (Rifle)
In other words, 139 inches per second is 0.0039 times the speed of a Bullet (Rifle), and the speed of a Bullet (Rifle) is 259 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 36,000 inches 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 one-two-thousandth as fast as The Space Shuttle
In other words, 139 inches per second is 0.0004559 times the speed of The Space Shuttle, and the speed of The Space Shuttle is 2,193.3 times that amount.
(Orbiter vehicle velocity)
The space shuttle orbits at a speed of 304,870 inches 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 one-ten-thousandth as fast as a Meteor
In other words, 139 inches per second is 0.000084 times the speed of a Meteor, and the speed of a Meteor is 12,000 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 440,000 inches per second and 2,800,000 inches 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 110,000 inches per second.