Aboat is pulled into a dock by means of a rope attached to a pulley on the dock. the rope is attached to the front of the boat, which is 9 feet below the level of the pulley.

if the rope is pulled through the pulley at a rate of 10 ft/min, at what rate will the boat be approaching the dock when 90 ft of rope is out?

The horizontal and vertical distances from the pulley form a right angle triangle, subtending an angle of ∅.
We calculate ∅ using:
tan(∅) = y/x
∅ = tan⁻¹(9/90)
∅ = 5.71°
The horizontal component of the boat's velocity can be obtained using:
Vx = Vcos(∅)
Vx = 10cos(5.71)
Vx = 9.95 ft/min

The boat approaches the dock at a rate of 9.95 ft/min

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.