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How fast is 273 yards per second?

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It's about three-fourths as fast as The Speed of Sound
In other words, 273 yards per second is 0.728 times the speed of The Speed of Sound, and the speed of The Speed of Sound is 1.37 times that amount.
(in dry air at 20°C)
The speed of sound in dry air at 20°C (68°F) is 375 yards per second. Air is a relatively poor acoustic conductor, however, as sound will travel at speeds of between 1,640 yards per second to 1,710 yards per second in water, depending on its salinity.
It's about two-thirds as fast as a Bullet (Handgun)
In other words, 273 yards per second is 0.65 times the speed of a Bullet (Handgun), and the speed of a Bullet (Handgun) is 1.54 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 419 yards 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-and-a-half times as fast as a Peregrine Falcon
In other words, 273 yards per second is 2.31 times the speed of a Peregrine Falcon, and the speed of a Peregrine Falcon is 0.433 times that amount.
(a.k.a. Peregrine, a.k.a. Duck Hawk, Falco peregrinus)
The Peregrine Falcon can reach speeds of up to 118 yards 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, 273 yards per second is 2.6 times the speed of The CRH (train), and the speed of The CRH (train) is 0.38 times that amount.
(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 110 yards per second. Theses train can make the 120 km (74 mi) journey from Beijing to Tianjin in about 30 minutes.
It's about two-fifths as fast as a Jet Fighter
In other words, 273 yards per second is 0.37 times the speed of a Jet Fighter, and the speed of a Jet Fighter is 2.7 times that amount.
(for Lockheed Martin F-16, a.k.a. Fighting Falcon, a.k.a. Viper) (maximum speed at altitude)
An F-16's maximum speed at altitude is approximately 730 yards per second. The F-16 has a flight ceiling of approximately 15 km (9.32 mi).
It's about two-and-a-half times as fast as a Porsche 911
In other words, 273 yards per second is 2.73 times the speed of a Porsche 911, and the speed of a Porsche 911 is 0.366 times that amount.
(for Porsche 911 Type 997 GT2, 2007 model)
The Porsche 911 GT2 has a top speed of 99.90 yards per second. It takes just 7.4 seconds for the GT2 to accelerate to 48.90 yards per second.
It's about three times as fast as an Arrow (archery)
In other words, 273 yards per second is 2.784 times the speed of an Arrow (archery), and the speed of an Arrow (archery) is 0.3592 times that amount.
(250 g arrow fired from 60#/28" bow)
A 250 gram arrow will reach speeds of approximately 98.06 yards 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.