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How fast is 0.09258 mach?

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It's about as fast as a Knuckleball (baseball).
(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 0.092 mach. Eddie Cicotte, who was later implicated in the 1919 Black Sox scandal, is credited with developing the pitch ca. 1906.
It's about as fast as a Cheetah.
(Acinonyx jubatus)
The cheetah can reach speeds of up to 0.09258 mach in short bursts. From a crouching position, the cheetah can attain these speeds in just 2.25 seconds.
It's about nine-tenths as fast as a Hurricane.
In other words, 0.09258 mach is 0.9270 times the speed of a Hurricane, and the speed of a Hurricane is 1.08 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 0.0997 mach. 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 0.260 mach.
It's about nine-tenths as fast as a Curveball (baseball).
In other words, the speed of a Curveball (baseball) is 1.10 times 0.09258 mach.
(a.k.a. hook, a.k.a. hammer, a.k.a. yakker) (major league average)
The average speed of major league curveball pitch is 0.10 mach. 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 three-fourths as fast as a Fastball (baseball).
In other words, the speed of a Fastball (baseball) is 1.30 times 0.09258 mach.
(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 0.130 mach. 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-and-a-half times as fast as a Greyhound.
In other words, 0.09258 mach is 1.530 times the speed of a Greyhound, and the speed of a Greyhound is 0.6540 times that amount.
(a.k.a. English greyhound) (approximate maximum speed)
Greyhounds reach average race speeds of 0.0607 mach. 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 three-fifths as fast as a Skydiver (belly-to-earth).
In other words, 0.09258 mach is 0.580 times the speed of a Skydiver (belly-to-earth), and the speed of a Skydiver (belly-to-earth) is 1.70 times that amount.
(Belly-to-Earth orientation, average conditions, terminal velocity)
A belly-to-Earth oriented skydiver's terminal velocity is about 0.160 mach. In a typical jump from 3,900 m (13,000 ft), a diver in this orientation will be in freefall for 60 seconds.