if we model a blade as a point mass at the midpoint of the blade, what is the inward force necessary to provide each blades centripetal acceleration

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.

Since the pully is a simple machine so the mechanical advantage is a 1

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