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Question
Figure shows the same block of wood floating in three different liquids A, B and C of densities ρ1, ρ2 and ρ3 respectively. Which of the liquid has the highest density? Give a reason for your answer.
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Solution
The upthrust on the body by each liquid is the same and equal to the weight of the body.
However, upthrust = Volume submerged × ρL × g,
For the liquid C, since the volume submerged is least so the density ρ3 must be maximum.
RELATED QUESTIONS
State whether the following statement is true or false :
The buoyant force depends on the nature of object immersed in the liquid
A body experiences the same buoyant force while floating in water or alcohol.
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Describe a simple experiment to demonstrate that a liquid enclosed in a vessel exerts pressure in all directions.
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The diagram below in Fig. 4.12 shows a device which makes the use of the principle of transmission of pressure.
- Name the parts labelled by the letters X and Y.
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- Give reasons for what happens to valves A and B in part (ii).
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- Give a reason for your answer in part (v).
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The S.I. unit of pressure is :
A block of iron of mass 7.5 kg and of dimensions 12 cm × 8 cm × 10 cm is kept on a table top on its base of side 12 cm × 8 cm.
Calculate:
- Thrust and
- Pressure exerted on the table top
Take 1 kgf = 10 N.
In what direction and at what point does the buoyant force on a body due to a liquid act?
What do you mean by buoyancy?
