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How fast is 745 knots?

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It's about nine-and-a-half times as fast as a Fastball (baseball).
In other words, the speed of a Fastball (baseball) is 0.110 times 745 knots.
(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 81 knots. 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 eleven times as fast as a Curveball (baseball).
In other words, the speed of a Curveball (baseball) is 0.091 times 745 knots.
(a.k.a. hook, a.k.a. hammer, a.k.a. yakker) (major league average)
The average speed of major league curveball pitch is 65 knots. 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 eleven-and-a-half times as fast as a Hurricane.
In other words, the speed of a Hurricane is 0.0862 times 745 knots.
(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 64.30 knots. 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 167 knots.
It's about twelve-and-a-half times as fast as a Cheetah.
In other words, 745 knots is 12.490 times the speed of a Cheetah, and the speed of a Cheetah is 0.08006 times that amount.
(Acinonyx jubatus)
The cheetah can reach speeds of up to 59.670 knots in short bursts. From a crouching position, the cheetah can attain these speeds in just 2.25 seconds.
It's about thirteen times as fast as a Knuckleball (baseball).
In other words, the speed of a Knuckleball (baseball) is 0.077 times 745 knots.
(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 59 knots. Eddie Cicotte, who was later implicated in the 1919 Black Sox scandal, is credited with developing the pitch ca. 1906.
It's about nineteen times as fast as a Greyhound.
In other words, 745 knots is 19.10 times the speed of a Greyhound, and the speed of a Greyhound is 0.0524 times that amount.
(a.k.a. English greyhound) (approximate maximum speed)
Greyhounds reach average race speeds of 39.10 knots. 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 745 knots.
(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 40 knots. 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).