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How fast is 0.2130 miles per second?

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It's about eight-and-a-half times as fast as a Fastball (baseball)
In other words, the speed of a Fastball (baseball) is 0.120 times 0.2130 miles per second.
(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 0.026 miles 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 ten times as fast as a Curveball (baseball)
In other words, the speed of a Curveball (baseball) is 0.10 times 0.2130 miles per second.
(a.k.a. hook, a.k.a. hammer, a.k.a. yakker) (major league average)
The average speed of major league curveball pitch is 0.021 miles 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 ten-and-a-half times as fast as a Hurricane
In other words, the speed of a Hurricane is 0.0962 times 0.2130 miles per second.
(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 0.0205 miles 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 0.0535 miles per second.
It's about eleven times as fast as a Knuckleball (baseball)
In other words, the speed of a Knuckleball (baseball) is 0.091 times 0.2130 miles per second.
(a.k.a. knuckler, a.k.a. floater, a.k.a. dancer, a.k.a. butterfly ball) (major league average)
The average speed of major league knuckleball pitch is 0.019 miles per second. Eddie Cicotte, who was later implicated in the 1919 Black Sox scandal, is credited with developing the pitch ca. 1906.
It's about eleven times as fast as a Cheetah
In other words, 0.2130 miles per second is 11.170 times the speed of a Cheetah, and the speed of a Cheetah is 0.08953 times that amount.
(Acinonyx jubatus)
The cheetah can reach speeds of up to 0.01907 miles per second in short bursts. From a crouching position, the cheetah can attain these speeds in just 2.25 seconds.
It's about seventeen times as fast as a Greyhound
In other words, 0.2130 miles per second is 17.10 times the speed of a Greyhound, and the speed of a Greyhound is 0.0585 times that amount.
(a.k.a. English greyhound) (approximate maximum speed)
Greyhounds reach average race speeds of 0.0125 miles per second. Despite their racing prowess, greyhounds are not considered energetic dogs — the typical greyhound race requires the dogs to run for less than 35 seconds.
It's about twenty times as fast as a Gazelle
In other words, the speed of a Gazelle is 0.05 times 0.2130 miles per second.
(for Thomson's Gazelle, a.k.a. Eudorcas thomsoni, a.k.a. "Tommie", a.k.a. "Tommy")
A Thomson's gazelle can reach speeds of up to 0.01 miles per second. The gazelle's speed doesn't match that of its chief predator, the cheetah, but a gazelle's endurance usually ensures an escape in distances greater than 500 m (0.3 mi).