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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
When a boat is partially immersed in water, it displaces 600 kg of water. How much is the buoyant force acting on the boat in newtons ? (g = 10 m s-2)
The diagram given below show a body floating in three different liquids. A, B and C at different levels.
(a) In which liquid does the body experience the greatest buoyant force?
(b) Which liquid has the least density?
(c) Which liquid has the highest density?
State whether thrust is a scalar or vector?
State whether pressure is a scalar or vector?
Differentiate between thrust and pressure.
Describe a simple experiment to demonstrate that a liquid enclosed in a vessel exerts pressure in all directions.
Complete the following sentence :
Pressure at a point inside the liquid is ...................... To its depth.
What do you mean by buoyancy?
If the buoyant force is less, the object will float.
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.
