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How fast is 543 miles per second?

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It's about 10,000 times as fast as a Helicopter.
In other words, 543 miles per second is 11,100 times the speed of a Helicopter, and the speed of a Helicopter is 0.00009010 times that amount.
(for AH-64A Apache, a.k.a. Hughes Model 77) (maximum cruise speed)
The AH-64 helicopter, one of the primary helicopters used by the United States Army, flies at a top cruise speed of 0.049 miles per second. The AH-64 is the primary military helicopter of several nations including the United States, the United Kingdom, Israel, Japan, and the Netherlands.
It's about 10,000 times as fast as a Skydiver (headfirst).
In other words, 543 miles per second is 12,000 times the speed of a Skydiver (headfirst), and the speed of a Skydiver (headfirst) is 0.0000830 times that amount.
(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 15,000 times as fast as a Tornado.
In other words, 543 miles per second is 15,828.340 times the speed of a Tornado, and the speed of a Tornado is 0.000063177820 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 15,000 times as fast as a Skydiver (belly-to-earth).
In other words, the speed of a Skydiver (belly-to-earth) is 0.0000630 times 543 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 20,000 times as fast as a Fastball (baseball).
In other words, 543 miles per second is 21,000 times the speed of a Fastball (baseball), and the speed of a Fastball (baseball) is 0.0000480 times that amount.
(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 25,000 times as fast as a Curveball (baseball).
In other words, the speed of a Curveball (baseball) is 0.0000380 times 543 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 25,000 times as fast as a Hurricane.
In other words, 543 miles per second is 26,400 times the speed of a Hurricane, and the speed of a Hurricane is 0.00003790 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.