What about brake fluid which is said to be incompressible. When I push down the brake pedal, the master cylindre pushes the brake liquid inside the hoses which tightens the brakes immediately? So what is the speed of propagation in this scenario if it cannot be faster than c even though brake fluid seems incompressible?
Professor John Stack received his Ph.D. in physics from the University of California, Berkeley, in 1965, after receiving a B.S. in physics from the California Institute of Technology in 1959. He joined the Department of Physics at the University of Illinois in 1966. Valued by his Illinois colleagues for the clarity of his thinking, thoroughness and physical insight, Professor Stack is a master of lattice gauge theory and has made important contributions to the understanding of confinement and other non-perturbative phenomena in quantum chromodynamics and high energy theory.
Professor Stack is also an effective and highly regarded teacher — large classess or small, introductory classes for non-science students or esoteric courses for advanced Ph.D. physics candidates — and an able mentor of graduate students. One of his former students wrote of him "… the most valuable thing that I got out of the meetings and out of my long association with John Stack was a deeper appreciation of just what it means to be a physicist. When we were stuck on some point, he would approach the problem from a physics point of view. Often as not, this would give to me new insight. This is the single most important part of my education…."
Since 2005, he has served as the associate head for graduate programs.
437B Loomis Laboratory
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