Why are hot gas clouds more dangerous than lava flow from a volcanic eruption? Hot gas clouds travel at a much faster speed than lava.
Hot gas clouds are hotter than lava.
Hot gas clouds are more dense than lava.
Hot gas clouds absorb all of the oxygen in the air.

Apassenger walks toward the rear of a moving train. describe her motion as seen from a reference point on the train. then describe it from a reference point on the ground

To do work, this truck uses energy stored in chemical fuel and an electrical battery. how much total energy does this truck put out?

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.