An astronomical telescope has its two lenses spaced 82.1 cmcm apart. If the objective lens has a focal length of 78.0 cmcm , what is the magnification of this telescope

An important dimensionless parameter concerned with very high-speed flow is the mach number, defined as v/c, where v is the speed of the object such as an airplane or projectile, and c is the speed of sound in the fluid surrounding the object. for a projectile traveling at 1170 mph through air at 50 ˚f and standard atmospheric pressure, what is the value of the mach number?