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How fast is 87 knots?

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It's about one-twentieth as fast as a Bullet (Rifle)
In other words, 87 knots is 0.049 times the speed of a Bullet (Rifle), and the speed of a Bullet (Rifle) is 20.4 times that amount.
(5.56 x 45 mm, a.k.a. 5.56 NATO)
A 5.56 x 45 mm cartridge is fired at a velocity of 1,780 knots. As the NATO rifle cartridge, it is used by the military forces of more than thirty-one countries, including use in the M16 series, M4 Carbine, HK-416, and M249 Squad automatic weapons used by the United States armed forces.
It's about twenty times as fast as Michael Phelps
In other words, 87 knots is 23.04 times the speed of Michael Phelps, and the speed of Michael Phelps is 0.04340 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 3.77590 knots. 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 thirty times as fast as Walking Pedestrians (in Manhattan)
In other words, 87 knots is 34 times the speed of Walking Pedestrians (in Manhattan), and the speed of Walking Pedestrians (in Manhattan) is 0.03 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 2.50 knots. Pedestrians wearing headphones, the study went on to find, walk at a slightly faster 2.70 knots
It's about 90 times as fast as an Iceberg
In other words, 87 knots is 90 times the speed of an Iceberg, and the speed of an Iceberg is 0.0 times that amount.
(a.k.a. Berg) (Newfoundland iceberg average)
Moved by ocean currents and wind, icebergs can drift at speeds of about 1 knot. 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-one-hundred-fiftieth as fast as The Space Shuttle
In other words, 87 knots is 0.005780 times the speed of The Space Shuttle, and the speed of The Space Shuttle is 173.0 times that amount.
(Orbiter vehicle velocity)
The space shuttle orbits at a speed of 15,052 knots. During liftoff, the space shuttle accelerates to orbital speed in 8.5 minutes, consuming over 1.59 million kg (3.51 million lbs) of propellant in the process.
It's about 650 times as fast as a Sloth
In other words, 87 knots is 670 times the speed of a Sloth, and the speed of a Sloth is 0.002 times that amount.
(for Brown-throated three-toed sloth, Bradypus variegatus)
The three-toed sloth moves along the ground at an average speed of 0.130 knots. Long thought to be lengthy sleepers, a 2008 study concluded that sloths sleep an average of only 9.6 hours per day.
It's about one-nine-hundredth as fast as a Meteor
In other words, 87 knots is 0.001 times the speed of a Meteor, and the speed of a Meteor is 910 times that amount.
(formally Meteoroid or meteorite, depending on the context; a.k.a. "shooting star", a.k.a. "falling star")
Small meteoroids enter the Earth's atmosphere at speeds between 22,000 knots and 140,000 knots, depending on their size. The fireball effect, known as ablation, ceases once the atmosphere has slowed the meteoroid to a velocity of about 5,400 knots.