Understanding questions (6 points) explain in your own words why it is important to understand the synchronization of clocks! state the two postulates einstein used for his theory of special relativity! under what conditions do the lorentz-transformations equal the galilean transformations? a) b) c)

Which of the following best describes internal energy? a. the difference between the kinetic and potential energies of the particles in a system b. the sum of the kinetic and potential energies of the particles in a system c. the sum of the kinetic and thermal energies of the particles in a system d. the difference between the kinetic and thermal energies of the particles in a system