Acar is traveling south at a speed of 62 miles per hour and then begins traveling at a speed of 63 miles per hour but continues traveling in the same direction. which of the following has changed? a. volume b. mass c. density d. velocity

Consider an insulating crystal, made up of layers of atoms. what form would you expect the temperature dependence of the phonon heat capacity to approach at extremely low temperatures if the interlayer coupling is i)very strong (rigid coupling), and ii) very weak. explain.