1. A schlieren photo of a bullet moving through air (see Video V11.10) at 14.7 psia and 68 °F indicates a Mach cone angle of 28°. How fast was the bullet moving in:
(a) m/s,
(b) ft/s,
(c) mph?
2. At a given instant of time, two pressure waves, each moving at the speed of sound, emitted by a point source moving with constant velocity in a fluid at rest are shown in Fig. P11.23. Determine the Mach number involved and indicate with a sketch the instantaneous location of the point source.
