The nucleus of any atom requires a strong force to hold it together. this strong force is required because a) the nucleus of any atom is so small. b) protons and neutrons repel each other. c) positive protons in the nucleus repel each other. d) the charges of the protons and the electrons cancel each other out.

Which best describes the first law of thermodynamics as compared to the second law of thermodynamics? a. the first law describes how thermal energy is conserved but not the direction it moves. b. the first law describes the direction thermal energy moves but not how it is conserved. c. the first law describes how thermal energy can be created but not how it can be destroyed. d. the first law describes how thermal energy can be destroyed but not how it can be created.