Which action can be explained by physics? a. the growth of fungus on a piece of breadb. the mixing of sodium and chlorine to form common saltc. the interactions between predators and prey in an ecosystemd. the pressure of blood exerted on the inner walls of the veins

A200-n force is applied to the foot-operated air pump. the return spring s exerts a 2.6-n·m moment on member oba for this position. determine the corresponding compression force c in the cylinder bd. if the diameter of the piston in the cylinder is 40 mm, estimate the air pressure generated for these conditions. state any assumptions. enter a positive number for the compression force c.