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How fast is 504 feet per hour?

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It's about one-seven-hundredth as fast as a Knuckleball (baseball).
In other words, 504 feet per hour is 0.0014 times the speed of a Knuckleball (baseball), and the speed of a Knuckleball (baseball) is 710 times that amount.
(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 360,000 feet per hour. Eddie Cicotte, who was later implicated in the 1919 Black Sox scandal, is credited with developing the pitch ca. 1906.
It's about one-seven-hundredth as fast as a Cheetah.
In other words, 504 feet per hour is 0.00139 times the speed of a Cheetah, and the speed of a Cheetah is 719.40 times that amount.
(Acinonyx jubatus)
The cheetah can reach speeds of up to 362,500 feet per hour in short bursts. From a crouching position, the cheetah can attain these speeds in just 2.25 seconds.
It's about one-seven-hundred-fiftieth as fast as a Curveball (baseball).
In other words, the speed of a Curveball (baseball) is 770 times 504 feet per hour.
(a.k.a. hook, a.k.a. hammer, a.k.a. yakker) (major league average)
The average speed of major league curveball pitch is 390,000 feet per hour. 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-eight-hundredth as fast as a Hurricane.
In other words, 504 feet per hour is 0.00129 times the speed of a Hurricane, and the speed of a Hurricane is 775 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 390,000 feet per hour. 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 1,020,000 feet per hour.
It's about one-one-thousandth as fast as a Fastball (baseball).
In other words, the speed of a Fastball (baseball) is 1,000 times 504 feet per hour.
(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 490,000 feet per hour. 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-one-thousandth as fast as a Skydiver (belly-to-earth).
In other words, 504 feet per hour is 0.00081 times the speed of a Skydiver (belly-to-earth), and the speed of a Skydiver (belly-to-earth) is 1,200 times that amount.
(Belly-to-Earth orientation, average conditions, terminal velocity)
A belly-to-Earth oriented skydiver's terminal velocity is about 620,000 feet per hour. 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-one-thousand-five-hundredth as fast as a Tornado.
In other words, 504 feet per hour is 0.0007729113 times the speed of a Tornado, and the speed of a Tornado is 1,293.810 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 580,800 feet per hour and 723,360 feet per hour. The largest recorded tornado — an F4 event occurring in Nebraska in May, 2004 — was almost 4.02 km (2.5 mi) across.