Suppose manufacturers modify the size of a vinyl record such that they are made of the same material and have the same thickness as a current record, but have half the diameter. By what factor will the moment of inertia decrease

It equals just about 6,300 km per hour each day an week

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.

This is kenetic energy.