412 Fluid MechanicsQ14.8In the ocean, the ship floats due to the buoyant force from salt water. Salt water is denser than freshwater. As the ship is pulled up the river, the buoyant force from the fresh water in the river is notsufficient to support the weight of the ship, and it sinks.Q14.9Exactly the same. Buoyancy equals density of water times volume displaced.Q14.10At lower elevation the water pressure is greater because pressure increases with increasing depthbelow the water surface in the reservoir (or water tower). The penthouse apartment is not so farbelow the water surface. The pressure behind a closed faucet is weaker there and the flow weakerfrom an open faucet. Your fire department likely has a record of the precise elevation of every firehydrant.Q14.11As the wind blows over the chimney, it creates a lower pressure at the top of the chimney. Thesmoke flows from the relatively higher pressure in front of the fireplace to the low pressure outside.
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