Weight loss. If your cat is overweight, you will want to feed for 2 pounds less, or 40 fewer calories a day, and readjust every time your cat loses a pound, until you hit a healthy weight, and then maintain.  Differences in metabolism.
Since the speed of sound through the standard atmosphere is 761 mph (1,223 km/h) at sea level, Mach 2 then follows as 1,522 mph (2,447 km/h). If you were to ask how fast is Mach 2 at an altitude of 30,000 ft (9,150 m), we would use the same methodology to find out that it is only 1,356 mph (2,180 km/h) because the speed of sound generally decreases as altitude increases.
Report Abuse. Mach number is an indication of speed relative to the speed of sound. So Mach 1.3 means you're going 30% faster than the speed of sound. Mach .9 means you're going 90% of the speed of sound.ource(s): Wikipedia Mach Number http://en.wikipedia.org/wiki/mach_number... NASA Mach number http://www.grc.nasa.gov/www/k-12/airplan... Report Abuse It was first used by Sir Ernest Mach who is credited with mesureing the speed of sound.