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How fast is 347.90 yards per hour?

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It's about one-three-hundred-fiftieth as fast as a Knuckleball (baseball).
In other words, the speed of a Knuckleball (baseball) is 340 times 347.90 yards per hour.
(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 120,000 yards 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-three-hundred-fiftieth as fast as a Cheetah.
In other words, 347.90 yards per hour is 0.002879 times the speed of a Cheetah, and the speed of a Cheetah is 347.30 times that amount.
(Acinonyx jubatus)
The cheetah can reach speeds of up to 120,800 yards per hour in short bursts. From a crouching position, the cheetah can attain these speeds in just 2.25 seconds.
It's about one-three-hundred-fiftieth as fast as a Hurricane.
In other words, 347.90 yards per hour is 0.00267 times the speed of a Hurricane, and the speed of a Hurricane is 375 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 130,000 yards 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 339,000 yards per hour.
It's about one-four-hundredth as fast as a Curveball (baseball).
In other words, 347.90 yards per hour is 0.0026 times the speed of a Curveball (baseball), and the speed of a Curveball (baseball) is 380 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 130,000 yards 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-four-hundred-fiftieth as fast as a Fastball (baseball).
In other words, the speed of a Fastball (baseball) is 450 times 347.90 yards 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 160,000 yards 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-six-hundredth as fast as a Skydiver (belly-to-earth).
In other words, 347.90 yards per hour is 0.0017 times the speed of a Skydiver (belly-to-earth), and the speed of a Skydiver (belly-to-earth) is 590 times that amount.
(Belly-to-Earth orientation, average conditions, terminal velocity)
A belly-to-Earth oriented skydiver's terminal velocity is about 210,000 yards 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-six-hundredth as fast as a Tornado.
In other words, 347.90 yards per hour is 0.00160057 times the speed of a Tornado, and the speed of a Tornado is 624.77740 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 193,600 yards per hour and 241,120 yards per hour. The largest recorded tornado — an F4 event occurring in Nebraska in May, 2004 — was almost 4.02 km (2.5 mi) across.