Question

Why does a ship rise up in the water when it passes from a river to the sea?

• A. The ship is less sheltered from strong winds while at sea, and these winds push up the ship.
• B. The ship lightens its load before going out to the sea.
• C. The seawater is more dense than the water in the river.
• D. The waves of the sea pushes the ship up in the water.

Answer 1

Answer: (C)

The seawater is more dense than the water in the river.

The sea water is denser than river water. Hence a ship experiences more buoyant force in sea water than in river and hence the volume of ship immersed inside water decreases to balance the weight of the ship. Hence it rises when it passes from river to sea.