Which country was used for apollo astronaut training because of its moonlike terrain?

Calculate the amount of heat produced when 18000 coulombs of charge is transferred in one hour through a potential difference of 50v

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is

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.