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How fast is 1.70 miles per second?

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It's about 90 times as fast as a Knuckleball (baseball)
In other words, 1.70 miles per second is 91 times the speed of a Knuckleball (baseball), and the speed of a Knuckleball (baseball) is 0.011 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 0.019 miles per second. Eddie Cicotte, who was later implicated in the 1919 Black Sox scandal, is credited with developing the pitch ca. 1906.
It's about 100 times as fast as a Gazelle
In other words, the speed of a Gazelle is 0.01 times 1.70 miles per second.
(for Thomson's Gazelle, a.k.a. Eudorcas thomsoni, a.k.a. "Tommie", a.k.a. "Tommy")
A Thomson's gazelle can reach speeds of up to 0.01 miles per second. The gazelle's speed doesn't match that of its chief predator, the cheetah, but a gazelle's endurance usually ensures an escape in distances greater than 500 m (0.3 mi).
It's about 100 times as fast as a Hare
In other words, the speed of a Hare is 0.01 times 1.70 miles per second.
(for European Brown Hare, a.k.a. Brown Hare, a.k.a. Lepus europaeus, a.k.a. Brown Hare)
The European Hare can run at speeds of up to 0.01 miles per second. While speed is a factor in their escapes, hares evade their chief predators — wolves, foxes, and golden eagles — by fleeing in a zigzag pattern.
It's about 150 times as fast as a Greyhound
In other words, 1.70 miles per second is 136 times the speed of a Greyhound, and the speed of a Greyhound is 0.00735 times that amount.
(a.k.a. English greyhound) (approximate maximum speed)
Greyhounds reach average race speeds of 0.0125 miles per second. Despite their racing prowess, greyhounds are not considered energetic dogs — the typical greyhound race requires the dogs to run for less than 35 seconds.
It's about 150 times as fast as Secretariat
In other words, 1.70 miles per second is 163 times the speed of Secretariat, and the speed of Secretariat is 0.00613 times that amount.
(at Belmont Stakes, 1973)
Setting a record finish, Secretariat ran the Belmont Stakes — a 12 furlong race length — in 2:24, for an average speed of 0.0104 miles per second in 1973. His margin of victory in the race, also a record-setter, was 31 lengths.
It's about 250 times as fast as Michael Johnson
In other words, 1.70 miles per second is 264.30 times the speed of Michael Johnson, and the speed of Michael Johnson is 0.003784 times that amount.
(a.k.a. Michael Duane Johnson) (sprinter; 1967-) (at the Atlanta Olympics, 1996)
Setting a record that stood for 12 years, Michael Johnson ran a 200 m in 0:19.32 for an average speed of 0.006433 miles per second at the 1996 Olympics. Johnson was nicknamed "the Man with the Golden shoes" in recognition of the custom footwear worn during these races — a pair of Nikes with a left size of 10.5 and a right size of 11.
It's about 250 times as fast as Usain Bolt
In other words, 1.70 miles per second is 266 times the speed of Usain Bolt, and the speed of Usain Bolt is 0.00376 times that amount.
(at the Beijing Olympics, 2008) (a.k.a. Usain St. Leo Bolt, OJ, C.D.) (sprinter; 1986-)
Setting a world record, Usain Bolt ran a 100 m in 0:09.69 for an average speed of 0.00642 miles per second at the 2008 Olympics. Furthermore, Bolt's margin of record breaking — 0.03 s — is the largest margin of victory in the history of digital measurements.