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An ice berg of density 900 Kg/m3 is floating in water of density 1000 Kg/m3 The percentage of volume of ice-cube outside the water is:

Correct answer: C. 10%

  • A. 20%
  • B. 35%
  • C. 10%
  • D. 25%

Explanation

The principle of buoyancy tells us that the weight of the water displaced by the submerged portion of the iceberg is equal to the weight of the entire iceberg. The density of the iceberg is 900 Kg/m3 and the density of water is 1000 Kg/m3. The fraction of the iceberg submerged is equal to the ratio of the densities (900/1000), which is 0.9 or 90%. Therefore, the percentage of the iceberg that is outside the water is 100% - 90% = 10%. This is why option C is correct. Other options suggest incorrect percentages based on the density relationship provided.

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Fluid flow is described through speed, pressure and density, including steady flow and the equation of continuity for conserving mass. Bernoulli's equation relates pressure, speed and height, while fluid drag and terminal velocity explain why a falling object eventually moves at constant speed when drag balances its weight.

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