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Fluid Mechanics — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsFluid Mechanics1 Mark
Question
A solid floats in a liquid in a partially dipped position.
  1. The solid exerts a force equal to its weight on the liquid.
  2. The liquid exerts a force of buoyancy on the solid which is equal to the weight of the solid.
  3. The weight of the displaced liquid equals the weight of the solid.
  4. The weight of the dipped part of the solid is equal to the weight of the displaced liquid.
✓

Answer

  1. The solid exerts a force equal to its weight on the liquid.
  2. The liquid exerts a force of buoyancy on the solid which is equal to the weight of the solid.
  3. The weight of the displaced liquid equals the weight of the solid.
Expalnation:
Force exerted by any solid on a liquid = F = mg = W = Weight of the solid.
According to Archimedes' principle, any object, wholly or partially immersed in a fluid, is buoyed up by a force equal to the weight of the fluid displaced by the
Object.
Also, any floating object displaces its own weight of fluid. Thus, we can say that the weight of the object is equal to the weight of the fluid displaced.

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