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प्रश्न
Higher Order Thinking Skill.
How does a fish manage to rise up and move down in water?
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उत्तर
Fish has an internal swim bladder which is filled with gas. When it needs to rise or descend, it changes the volume and its density by filling this bladder with oxygen collected from the surrounding water through gills. When the bladder is filled with oxygen gas, the fish has a greater volume, with minimal increase in weight. When the bladder is expanded, it displaces more water and so experiences a greater force of buoyancy.
When the bladder is completely inflated, the fish has maximum volume and is pushed to the surface. When the bladder is completely deflated, the fish has minimum volume and sinks to the ocean floor.
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संबंधित प्रश्न
State whether the following statement is true or false :
The buoyant force depends on the nature of object immersed in the liquid
What causes buoyant force (or upthrust) on a boat ?
A body experiences the same buoyant force while floating in water or alcohol.
Why do we feel light on our feet when standing in a swimming pool with water up to our armpits ?
The density of a body which sinks in water is ......... than 1000 Kg m-3.
A boy get into a floating boat.
What happens to the buoyant force on the boat ?
The pressure inside a liquid of density p at a depth h is :
What is the cause of upthrust? At which point can it be considered to act?
Complete the following sentence.
Mass = .................... × density
Assertion (A): The buoyant force on a submerged rigid object can be considered to be acting at the center of mass of the object.
Reason (R): In rigid body, force distributed uniformly through its volume can be considered to be acting at the centre of mass of the body.
