Sometimes it has bad days and very stupid.
What happens to the Mach cone - after the projectile hit the target? It won’t disappear.
Butler PA
scroll down for more pictures here:
Recently I work on the wave propagation - incorporate Green’s function into Huygens-Fresnel. (Preserve thin layer wavefront source, but introduce Hamiltonian phase space = location and velocity.)
the 4-gradient:
du/dt is complex phase
du/dx is wave number, k-vector
Kirk shooting: people turned their heads
(un)fortunately I was never shot, never heard the Doppler of the projectile.
(However, when I was hit by a car, I had to call ambulance for the driver.)