What force is required to accelerate a body with a mass of 15kilograms at a rate of

What property is a characteristic of a substance that can be observed and does not change the identity of the substance

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island

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.