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JAMB Physics 2000 Question 4

Question 4

Density and Upthrust

When a ship sails from salt water into fresh water, the fraction of its volume above the water surface will

  1. A.remain the same
  2. B.increase
  3. C.decrease
  4. D.increase then decrease.
Show the answer and explanation

Answer: C (decrease)

Explanation

Fresh water is less dense, so the ship must sink deeper to displace its own weight; less of it stays above the surface.