Suppose there are 5 properties of a material (color, size, temperature, etc.) and you want to test how something depends on one of those properties. To correctly perform an experiment, how many dependent variables can you have, how many independent, and how many variables must remain the same?

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?