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How fast is 678 yards per minute?

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It's about one-fourth as fast as a Fastball (baseball).
In other words, 678 yards per minute is 0.250 times the speed of a Fastball (baseball), and the speed of a Fastball (baseball) is 4 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 2,700 yards per minute. 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-fifth as fast as a Skydiver (belly-to-earth).
In other words, 678 yards per minute is 0.190 times the speed of a Skydiver (belly-to-earth), and the speed of a Skydiver (belly-to-earth) is 5.30 times that amount.
(Belly-to-Earth orientation, average conditions, terminal velocity)
A belly-to-Earth oriented skydiver's terminal velocity is about 3,500 yards per minute. 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 five-and-a-half times as fast as Michael Phelps.
In other words, 678 yards per minute is 5.31930 times the speed of Michael Phelps, and the speed of Michael Phelps is 0.187990 times that amount.
(at the Beijing Olympics, 2008; 200 m freestyle) (a.k.a. Michael Fred Phelps) (swimmer; 1985-)
Setting a world record, Michael Phelps swam the 200 m freestyle in 1:42.96 for an average speed of 127.460 yards per minute. Phelps would go on to win nine gold medals individually in the 2008 Olympics - more than all but eight of the competing nations.
It's about one-fifth as fast as a Tornado.
In other words, 678 yards per minute is 0.1871550 times the speed of a Tornado, and the speed of a Tornado is 5.3431650 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 3,226.6670 yards per minute and 4,018.6670 yards per minute. 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 one-tenth as fast as a Skydiver (headfirst).
In other words, 678 yards per minute is 0.140 times the speed of a Skydiver (headfirst), and the speed of a Skydiver (headfirst) is 7.10 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 4,700 yards per minute. 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 one-tenth as fast as a Helicopter.
In other words, 678 yards per minute is 0.1310 times the speed of a Helicopter, and the speed of a Helicopter is 7.630 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 5,180 yards per minute. 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 eight times as fast as Walking Pedestrians (in Manhattan).
In other words, 678 yards per minute is 7.90 times the speed of Walking Pedestrians (in Manhattan), and the speed of Walking Pedestrians (in Manhattan) is 0.130 times that amount.
(Manhattan; average speed; 8,978 person-sample)
A 2006 Study by the New York City Department of City Planning found that pedestrians in that city walk at an average rate of 85 yards per minute. Pedestrians wearing headphones, the study went on to find, walk at a slightly faster 93 yards per minute