Which statement about changes in states of matter is false? Energy is always required to change the state of a substance from solid to gas Pure substances as well as mixtures can change states Of all substances, only water can exist in any state of matter An example of sublimation is an ice cube that slowly shrinks in the freezer

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.