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How fast is 1.70 miles per second?

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It's about forty times as fast as a Skydiver (headfirst).
In other words, the speed of a Skydiver (headfirst) is 0.026 times 1.70 miles per second.
(Head-to-Earth orientation or standing, average conditions, terminal velocity)
A head-to-Earth or standing-oriented skydiver's terminal velocity assuming average conditions is about 0.045 miles per second. In a typical jump from 3,900 m (13,000 ft), a diver in this orientation will be in freefall for 46 seconds.
It's about 50 times as fast as a Tornado.
In other words, 1.70 miles per second is 49.554660 times the speed of a Tornado, and the speed of a Tornado is 0.02017974 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 0.03055556 miles per second and 0.03805556 miles per second. The largest recorded tornado — an F4 event occurring in Nebraska in May, 2004 — was almost 4.02 km (2.5 mi) across.
It's about 50 times as fast as a Skydiver (belly-to-earth).
In other words, the speed of a Skydiver (belly-to-earth) is 0.019 times 1.70 miles per second.
(Belly-to-Earth orientation, average conditions, terminal velocity)
A belly-to-Earth oriented skydiver's terminal velocity is about 0.033 miles per second. 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 65 times as fast as a Fastball (baseball).
In other words, the speed of a Fastball (baseball) is 0.015 times 1.70 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 80 times as fast as a Curveball (baseball).
In other words, the speed of a Curveball (baseball) is 0.013 times 1.70 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 85 times as fast as a Hurricane.
In other words, 1.70 miles per second is 82.70 times the speed of a Hurricane, and the speed of a Hurricane is 0.0121 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 0.0205 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 90 times as fast as a Cheetah.
In other words, 1.70 miles per second is 89.150 times the speed of a Cheetah, and the speed of a Cheetah is 0.01122 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.