If the mass of a spaceship is approximately 5x10^9 kg, how much mass must be converted into kinetic energy to accelerate it from rest to one-tenth the speed of light? How much mass would be required to decelerate the spaceship to rest in space? Recall that there is no friction in space.

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.