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How fast is 139 inches per second?

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It's about one-tenth as fast as a Cheetah
In other words, 139 inches per second is 0.115 times the speed of a Cheetah, and the speed of a Cheetah is 8.696 times that amount.
(Acinonyx jubatus)
The cheetah can reach speeds of up to 1,208 inches per second in short bursts. From a crouching position, the cheetah can attain these speeds in just 2.25 seconds.
It's about one-tenth as fast as a Hurricane
In other words, 139 inches per second is 0.107 times the speed of a Hurricane, and the speed of a Hurricane is 9.35 times that amount.
(formally: Topical cyclone; a.k.a. typhoon)
A hurricane is defined by the US National Hurricane Center as a Northern Hemisphere tropical storm having one-minute average wind-speeds of at least 1,300 inches per second. Typhoons Tip (October, 1979) and Keith (October, 1997) and Hurricanes Camille (August, 1969) and Allen (August, 1980) jointly hold the record for highest tropical storm wind speeds at 3,390 inches per second.
It's about one-tenth as fast as a Curveball (baseball)
In other words, 139 inches per second is 0.1 times the speed of a Curveball (baseball), and the speed of a Curveball (baseball) is 10 times that amount.
(a.k.a. hook, a.k.a. hammer, a.k.a. yakker) (major league average)
The average speed of major league curveball pitch is 1,300 inches per second. In the 1940's, debate over whether there really was a curve in the curveball pitch was settled with the conclusion that the ball does curve; however, an optical illusion caused by the spin of the ball and the batter's perception of motion exaggerates the extent of the curve.
It's about one-tenth as fast as a Fastball (baseball)
In other words, 139 inches per second is 0.09 times the speed of a Fastball (baseball), and the speed of a Fastball (baseball) is 12 times that amount.
(a.k.a. rising fastball, a.k.a. cross-seam fastball, a.k.a. heater, a.k.a. hummer, a.k.a. smoker; for four-seam grip) (major league average)
The average speed of major league fastball pitch is 1,600 inches per second. When up against the quickest professional fastball pitchers, a batter may have less than 0.4 seconds to react to a pitched ball.
It's about one-fifteenth as fast as a Skydiver (belly-to-earth)
In other words, 139 inches per second is 0.07 times the speed of a Skydiver (belly-to-earth), and the speed of a Skydiver (belly-to-earth) is 15 times that amount.
(Belly-to-Earth orientation, average conditions, terminal velocity)
A belly-to-Earth oriented skydiver's terminal velocity is about 2,100 inches per second. In a typical jump from 3,900 m (13,000 ft), a diver in this orientation will be in freefall for 60 seconds.
It's about one-fifteenth as fast as a Tornado
In other words, 139 inches per second is 0.0639492 times the speed of a Tornado, and the speed of a Tornado is 15.63741 times that amount.
(EF2) (wind speed range average)
According to the Enhanced Fujita scale implemented by the US National Oceanographic and Atmospheric Administration, a "significant" tornado has an Enhanced Funjita scale classification of EF2 and is characterized by wind gust speeds between 1,936 inches per second and 2,411.20 inches per second. The largest recorded tornado — an F4 event occurring in Nebraska in May, 2004 — was almost 4.02 km (2.5 mi) across.
It's about one-twentieth as fast as a Skydiver (headfirst)
In other words, 139 inches per second is 0.05 times the speed of a Skydiver (headfirst), and the speed of a Skydiver (headfirst) is 20 times that amount.
(Head-to-Earth orientation or standing, average conditions, terminal velocity)
A head-to-Earth or standing-oriented skydiver's terminal velocity assuming average conditions is about 2,800 inches per second. In a typical jump from 3,900 m (13,000 ft), a diver in this orientation will be in freefall for 46 seconds.