A mechanic is trying to loosen a nut with a wrench, but it is stuck. What could the mechanic do to help loosen the nut? (Hint: This is a wheel and axle situation.)
A. Use a heavier wrench.
B. Use a lighter wrench.
C. Use a longer wrench.
D. Use a shorter wrench.

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?