Hey are you from Calvert too? I got the same questions for the DBA
The correct choices are: (2) the particles in the Warner cup has more kinetic energy and (3) if there are two different amounts of the same liquid the temp is a good way to compare thermal energies
Nuclear energy is far more efficient than most other types of energy. It is also a lot more dangerous. It does however provide a lot of energy so it positively effects the economy.