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How fast is 955 mach?

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It's about one-nine-hundred-fiftieth as fast as The Speed of Light.
In other words, 955 mach is 0.00105617541 times the speed of The Speed of Light, and the speed of The Speed of Light is 946.812424 times that amount.
(C) (in a vacuum)
The speed of light (and all other electromagnetic radiation) in a perfect vacuum is known as "c" and measures exactly 904,205.862 mach, per the formal definition of the meter. While visible light travels close to this speed in air, it slows to 602,803.908 mach when passing through the glass of a typical window.
It's about 3,000 times as fast as a Peregrine Falcon.
In other words, 955 mach is 2,930 times the speed of a Peregrine Falcon, and the speed of a Peregrine Falcon is 0.000341 times that amount.
(a.k.a. Peregrine, a.k.a. Duck Hawk, Falco peregrinus)
The Peregrine Falcon can reach speeds of up to 0.326 mach 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 3,500 times as fast as The CRH (train).
In other words, the speed of The CRH (train) is 0.0003 times 955 mach.
(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 0.29 mach. Theses train can make the 120 km (74 mi) journey from Beijing to Tianjin in about 30 minutes.
It's about 3,500 times as fast as a Porsche 911.
In other words, 955 mach is 3,460 times the speed of a Porsche 911, and the speed of a Porsche 911 is 0.000289 times that amount.
(for Porsche 911 Type 997 GT2, 2007 model)
The Porsche 911 GT2 has a top speed of 0.276 mach. It takes just 7.4 seconds for the GT2 to accelerate to 0.135 mach.
It's about 3,500 times as fast as an Arrow (archery).
In other words, 955 mach is 3,531 times the speed of an Arrow (archery), and the speed of an Arrow (archery) is 0.0002832 times that amount.
(250 g arrow fired from 60#/28" bow)
A 250 gram arrow will reach speeds of approximately 0.2704 mach 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 3,500 times as fast as a Lamborghini Gallardo.
In other words, the speed of a Lamborghini Gallardo is 0.00028 times 955 mach.
(for Gallardo LP 550-2, a.k.a. Valentino Balboni, 2009 model)
The Lamborghini Gallardo LP550-2 model Gallardo has a top speed of 0.27 mach. The Gallardo can reach speeds of 0.084 mach in just 3.9 seconds.
It's about 3,500 times as fast as The TGV (train).
In other words, the speed of The TGV (train) is 0.00028 times 955 mach.
(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 0.27 mach. The train is capable of travelling the 425 km (264 mi) distance from Paris to Lyon in East-Central France in about two hours.