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How fast is 543 miles per second?

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It's about 2,500 times as fast as The Speed of Sound.
In other words, 543 miles per second is 2,550 times the speed of The Speed of Sound, and the speed of The Speed of Sound is 0.000392 times that amount.
(in dry air at 20°C)
The speed of sound in dry air at 20°C (68°F) is 0.2130 miles per second. Air is a relatively poor acoustic conductor, however, as sound will travel at speeds of between 0.930 miles per second to 0.9690 miles per second in water, depending on its salinity.
It's about 8,000 times as fast as a Peregrine Falcon.
In other words, 543 miles per second is 8,090 times the speed of a Peregrine Falcon, and the speed of a Peregrine Falcon is 0.000124 times that amount.
(a.k.a. Peregrine, a.k.a. Duck Hawk, Falco peregrinus)
The Peregrine Falcon can reach speeds of up to 0.0671 miles per second when diving. Falcons are sometimes sent to scare smaller birds away from airports to improve air traffic safety and were used in World War II to intercept carrier pigeons used by enemy forces.
It's about 9,000 times as fast as The CRH (train).
In other words, the speed of The CRH (train) is 0.00011 times 543 miles per second.
(a.k.a. Hexie Hao, 和谐号, a.k.a. 和諧號, a.k.a. Héxié Hào, a.k.a. "Harmony")
The CRH-3 train which runs on China's Beijing-Tianjin Intercity Railway are capable of speeds up to 0.06 miles per second. Theses train can make the 120 km (74 mi) journey from Beijing to Tianjin in about 30 minutes.
It's about 9,500 times as fast as a Porsche 911.
In other words, 543 miles per second is 9,560 times the speed of a Porsche 911, and the speed of a Porsche 911 is 0.000105 times that amount.
(for Porsche 911 Type 997 GT2, 2007 model)
The Porsche 911 GT2 has a top speed of 0.0568 miles per second. It takes just 7.4 seconds for the GT2 to accelerate to 0.0278 miles per second.
It's about 9,500 times as fast as an Arrow (archery).
In other words, 543 miles per second is 9,745 times the speed of an Arrow (archery), and the speed of an Arrow (archery) is 0.0001026 times that amount.
(250 g arrow fired from 60#/28" bow)
A 250 gram arrow will reach speeds of approximately 0.05572 miles per second when fired from a 60-lb, 28-inch draw bow . Archeological evidence from the Ahrensburg valley near Hamburg, Germany indicates that arrows have been used since at least 11 to 12,000 years ago.
It's about 10,000 times as fast as a Lamborghini Gallardo.
In other words, 543 miles per second is 9,800 times the speed of a Lamborghini Gallardo, and the speed of a Lamborghini Gallardo is 0.0001 times that amount.
(for Gallardo LP 550-2, a.k.a. Valentino Balboni, 2009 model)
The Lamborghini Gallardo LP550-2 model Gallardo has a top speed of 0.055 miles per second. The Gallardo can reach speeds of 0.017 miles per second in just 3.9 seconds.
It's about 10,000 times as fast as The TGV (train).
In other words, 543 miles per second is 9,800 times the speed of The TGV (train), and the speed of The TGV (train) is 0.0001 times that amount.
(Train à Grande Vitesse) (for SNCF TGV Réseau, a.k.a. "Network" model, a.k.a. TGV-R) (maximum speed)
The TGV Réseau sets have a top speed of 0.055 miles per second. The train is capable of travelling the 425 km (264 mi) distance from Paris to Lyon in East-Central France in about two hours.