Abullet with a mass of 8.0 g and a speed of 650 m/s is fired at a block of wood with a mass of 0.250 kg. the block rests on a frictionless surface, and is thin enough that the bullet passes completely through it. immediately after the bullet exits the block, the speed of the block is 12 m/s. what is the speed of the bullet when it exits the block

The answer is water molecules are split.cellular respiration and photosynthesis are complement  reactions to each other. these are reverse reactions. in cellular respiration glucose and oxygen yield water and carbon dioxide. so, when respiration begins,  glucose molecules are split. in the opposite reaction - in photosynthesis, carbon dioxide and water yield glucose and oxygen. thus,  when respiration begins, water molecules are split.

Answer///air resistance,drag;

An atom's smaller negative particles are at a distance from the central positive particles, so the negative particles are easier to move.