1. (a) What is a Mach number?
(b) If a vehicle is labeled Mach 12, what does it mean?
(c) What does breaking the sound barrier mean?
(d) Who was the first person to break the sound barrier?
(e) Is the person in (d) still alive? If not when did he or she die?
1. (a) What is a Mach number? (b) If a vehicle is labeled Mach 12, what does it mean? (c) What does breaking the sound b
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