"A stack of five textbooks, each with a weight of 14 N, is resting on a table. What is the normal force acting on the middle textbook in the stack?"

The duration of a photographic flash is related to an rc time constantly

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.