Calculate the equilibrium number of vacancies per cubic meter for copper at 27°c and 1000°c, respectively. assume that the energy for vacancy formation is 0.9 ev/atom; the atomic weight and density (at both 27 and 1000 ° c) for copper are 63.5 g/mol and 8.4 g/cm3, respectively

Amachinist needs to remove a tight fitting pin of material a from a hole in a block made of material b. the machinist heats both the pin and the block to the same high temperature and removes the pin easily. what statement relates the coefficient of thermal expansion of material a to that of material b? a) the situation is not possible, heating block b will shrink the hole in the material as the material expands with increasing temperatureb) material b has the same coefficient of expansion as does material ac) material b has a negative coefficient of expansion and a has a positive coefficient of expansiond) material a has a greater coefficient of expansion than does material be) material b has a greate

Ahydroelectric plant takes energy from water and turns it into electrical energy. what are the transformations of energy in the water molecules that are used in the process of generating electricity this way?

Amira pulls a 3 pound wagon 4 feet. how much work has she done?