A 50.0 kg shell was fired from a cannon at earth's surface to a maximum height of 400. m. What is the potential energy at maximum height?

This is what a calorimeter is used for simpler ex, to measure calories in food.

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.

The answer is periosteum