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Standard IX
Physics
Question

It is easier to swim in sea water as compared to fresh water because

  1. Sea water exerts a greater force on the swimmer
  2. Sea water exerts a lesser force on the swimmer
  3. Sea water exerts an equal force on the swimmer
  4. None of the above

A
None of the above
B
Sea water exerts a greater force on the swimmer
C
Sea water exerts a lesser force on the swimmer
D
Sea water exerts an equal force on the swimmer
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Solution
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According to Archimedes Principle, the magnitude of buoyant force experienced is equal to the weight of liquid displaced by it by being placed in it.
Hence B=Vimmersedρg∝ρ
Since the density of sea water is greater than that of fresh water, the swimmer experiences higher buoyant force upwards and feels lesser weight and it is, thus, easier to swim.

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