It's about as fast as Walking Pedestrians (in Manhattan).
In other words, the speed of Walking Pedestrians (in Manhattan) is 1 times 0.0039 mach.(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-thirds as fast as Michael Phelps.
In other words, 0.0039 mach is 0.665670 times the speed of Michael Phelps, and the speed of Michael Phelps is 1.50220 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 half as fast as a Crocodile.
In other words, 0.0039 mach is 0.480 times the speed of a Crocodile, and the speed of a Crocodile is 2.10 times that amount.(American Crocodile, Crocodylus acutus) (swimming speed)
An American crocodile can reach speeds in the water of up to 0.0084 mach. On land, larger crocodiles can "gallop" when fleeing danger at speeds of up to 0.017 mach.
It's about three times as fast as an Iceberg.
In other words, the speed of an Iceberg is 0.30 times 0.0039 mach.(a.k.a. Berg) (Newfoundland iceberg average)
Moved by ocean currents and wind, icebergs can drift at speeds of about 0.002 mach. The largest iceberg ever recorded was a found near Baffin Island, Nunavut and was estimated to be nine billion metric tons.
It's about one-fifth as fast as a Bull.
In other words, 0.0039 mach is 0.190 times the speed of a Bull, and the speed of a Bull is 5.30 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 one-fifth as fast as Noah Ngeny.
In other words, 0.0039 mach is 0.17060 times the speed of Noah Ngeny, and the speed of Noah Ngeny is 5.8620 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 one-tenth as fast as Flo-Jo.
In other words, 0.0039 mach is 0.1380 times the speed of Flo-Jo, and the speed of Flo-Jo is 7.2460 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.