If a lightning occurred exactly 1 mile from your location, how many seconds will it take for the sound waves created by the thunder to reach your  ears at 343 m/s?

If an atom contains 11 protons in its nucleus, predict the element with the atomic number and electronic configuration. will the number of electrons remain the same during the chemical reaction in such an atom? explain.

Aball has an initial velocity of 3 m/s. if there is no friction, what is the highest it could roll?

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.