It's about as fast as a Crocodile.
It's about one-and-two-fifths times as fast as Michael Phelps.
In other words, 0.0084 mach is 1.43370 times the speed of Michael Phelps, and the speed of Michael Phelps is 0.69750 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 0.0058588 mach. 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 two times as fast as Walking Pedestrians (in Manhattan).
In other words, 0.0084 mach is 2.10 times the speed of Walking Pedestrians (in Manhattan), and the speed of Walking Pedestrians (in Manhattan) is 0.480 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 0.0039 mach. Pedestrians wearing headphones, the study went on to find, walk at a slightly faster 0.0043 mach
It's about two-fifths as fast as a Bull.
In other words, 0.0084 mach is 0.420 times the speed of a Bull, and the speed of a Bull is 2.40 times that amount.(for animals involved in the Running of the Bulls, a.k.a. Encierro, San Fermin, Pamplona, Spain) (herd average speed)
The herd of the annual Encierro in Pamplona, Spain runs at an average speed of 0.02 mach. The Encierro is run annually from July 7th through July 14th and involves 42 bulls, 77 oxen, and an estimated 17,000 runners over the course of the event.
It's about two-fifths as fast as Noah Ngeny.
In other words, 0.0084 mach is 0.36750 times the speed of Noah Ngeny, and the speed of Noah Ngeny is 2.7210 times that amount.(in Rieti, Italy; 1999) (sprinter; 1978-)
Setting a world record at the Rieti Grand Prix in 1999, Noah Ngeny ran 1,000 m in 2:11.96 for an average speed of 0.02286 mach. According to some reports, Ngeny did not begin running competitively until just three years before setting the record.
It's about three-tenths as fast as Flo-Jo.
In other words, 0.0084 mach is 0.29720 times the speed of Flo-Jo, and the speed of Flo-Jo is 3.3650 times that amount.(at the Seoul Olympics, 1998) (a.k.a. Florence Griffith-Joyner, a.k.a. Florence Delorez Griffith) (swimmer; 1959-1998)
Setting a world record in 1988, Flo-Jo ran a 200 m in 0:21.34 for an average speed of 0.02827 mach. Known as a 200 m runner, Joyner also set a record time in a 100 m race at in 1987.
It's about one-fourth as fast as Usain Bolt.
In other words, 0.0084 mach is 0.270 times the speed of Usain Bolt, and the speed of Usain Bolt is 3.70 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 0.0312 mach 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.