Please try again later. Watch this video to properly learn how to rethread your Safety 1st Alpha Omega car seat harness. Also applies to the Cosco Alpha Omega, Safety 1st Alpha Omega All in One, Able 65, Aquos 65 and All in One Sport car seats.atch this video to properly learn how to rethread your Safety 1st Alpha Omega car seat harness.
Story highlights. 1  Chuck Yeager was the first test pilot to break the sound barrier. 2  In 1947, he flew past Mach 1 after being dropped from a B-29 bomber at 45,000 feet. 3  Yeager said he laid down a pretty good sonic boom over Edwards Air Force Base.
The speed of sound is the distance travelled per unit time by a sound wave propagating through an elastic medium. The SI unit of speed is the metre per second (m/s). In dry air at 20 Â°C, the speed of sound is 343.2 metres per second (1,126 ft/s). This is 1,236 kilometres per hour (768 mph; 667 kn), or a kilometre in 2.914 s or a mile in 4.689 s.