Current is measured in Amperes (usually just referred to as âAmpsâ). An ampere is defined as 6.241*10 18 electrons (1 Coulomb) per second passing through a point in a circuit. Amps are represented in equations by the letter âIâ.
The X-1, piloted by Chuck Yeager, was the first manned airplane to exceed the speed of sound in level flight and was the first of the X-planes, a series of American experimental rocket planes (and non-rocket planes) designated for testing of new technologies and often kept secret.
Sound Waves And Airplanes. As a plane travels, it compresses air molecules in front of it, creating waves that spread in all directions. These waves travel at the speed of sound and are known as sound waves. When a plane itself approaches the speed of sound, which is roughly 768 miles per hour, it begins to move as fast as the sound waves it is creating.