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How fast is 0.00081 miles per second?

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It's about one-tenth as fast as Usain Bolt.
In other words, 0.00081 miles per second is 0.1270 times the speed of Usain Bolt, and the speed of Usain Bolt is 7.870 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.
It's about one-tenth as fast as Michael Johnson.
In other words, 0.00081 miles per second is 0.12590 times the speed of Michael Johnson, and the speed of Michael Johnson is 7.9430 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 one-fifteenth as fast as Secretariat.
In other words, the speed of Secretariat is 12.90 times 0.00081 miles per second.
(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 one-fifteenth as fast as a Gazelle.
In other words, the speed of a Gazelle is 10 times 0.00081 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 one-fifteenth as fast as a Hare.
In other words, the speed of a Hare is 10 times 0.00081 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 one-fifteenth as fast as a Greyhound.
In other words, the speed of a Greyhound is 15.40 times 0.00081 miles per second.
(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 nineteen times as fast as a Sloth.
In other words, the speed of a Sloth is 0.053 times 0.00081 miles per second.
(for Brown-throated three-toed sloth, Bradypus variegatus)
The three-toed sloth moves along the ground at an average speed of 0.0000410 miles per second. Long thought to be lengthy sleepers, a 2008 study concluded that sloths sleep an average of only 9.6 hours per day.