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How fast is 738 feet per second?

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It's about two-thirds as fast as The Speed of Sound.
In other words, 738 feet per second is 0.6560 times the speed of The Speed of Sound, and the speed of The Speed of Sound is 1.520 times that amount.
(in dry air at 20°C)
The speed of sound in dry air at 20°C (68°F) is 1,130 feet per second. Air is a relatively poor acoustic conductor, however, as sound will travel at speeds of between 4,910 feet per second to 5,120 feet per second in water, depending on its salinity.
It's about three-fifths as fast as a Bullet (Handgun).
In other words, 738 feet per second is 0.5860 times the speed of a Bullet (Handgun), and the speed of a Bullet (Handgun) is 1.710 times that amount.
(for .40 Smith & Wesson 135 grain Sierra JHP, VV 3N37 powder, Fed. 100 primer, Remington case) (muzzle velocity)
A 0.40 caliber Smith & Wesson bullet has a muzzle a velocity of 1,260 feet per second. This type of ammunition has been the standard issue round of the United States Federal Bureau of Investigation (FBI) since 1990.
It's about two times as fast as a Peregrine Falcon.
In other words, 738 feet per second is 2.08 times the speed of a Peregrine Falcon, and the speed of a Peregrine Falcon is 0.4810 times that amount.
(a.k.a. Peregrine, a.k.a. Duck Hawk, Falco peregrinus)
The Peregrine Falcon can reach speeds of up to 355 feet 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 two-and-a-half times as fast as The CRH (train).
In other words, the speed of The CRH (train) is 0.430 times 738 feet 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 320 feet per second. Theses train can make the 120 km (74 mi) journey from Beijing to Tianjin in about 30 minutes.
It's about two-and-a-half times as fast as a Porsche 911.
In other words, 738 feet per second is 2.460 times the speed of a Porsche 911, and the speed of a Porsche 911 is 0.4070 times that amount.
(for Porsche 911 Type 997 GT2, 2007 model)
The Porsche 911 GT2 has a top speed of 300 feet per second. It takes just 7.4 seconds for the GT2 to accelerate to 147 feet per second.
It's about two-and-a-half times as fast as a Lamborghini Gallardo.
In other words, the speed of a Lamborghini Gallardo is 0.40 times 738 feet per second.
(for Gallardo LP 550-2, a.k.a. Valentino Balboni, 2009 model)
The Lamborghini Gallardo LP550-2 model Gallardo has a top speed of 290 feet per second. The Gallardo can reach speeds of 91 feet per second in just 3.9 seconds.
It's about two-and-a-half times as fast as The TGV (train).
In other words, the speed of The TGV (train) is 0.40 times 738 feet per second.
(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 290 feet 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.