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प्रश्न
What is upthrust ?
उत्तर
Upthrust (buoyant force) is the upward force exerted by a liquid when an object is immersed in it.
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संबंधित प्रश्न
A body experiences the same buoyant force while floating in water or alcohol.
The weight of a body floating in a liquid is ........
What is a density bottle? How is it used to find the density of a liquid?
A plastic cube is released into the water. Will it sink or come to the surface of the water?
How does the pressure exerted by thrust depend on the area of surface on which it acts? Explain with a suitable example.
Complete the following sentence :
Pressure is .................... in all directions about a point in a liquid.
A small block of wood is completely immersed in (i) water, (ii) glycerine and then released. In each case, What do you observe? Explain the difference in your observation in the two cases.
A beaker contains a liquid of density ‘ρ’ up to height ‘h’ such that ‘PA’ is atmospheric pressure and ‘g’ is the acceleration due to gravity. Answer the following questions:
- What is the pressure on the free surface of the liquid?
- What is the pressure on the base of the beaker?
- What is the lateral pressure at the base on the inner walls of the beaker?
State whether true or false. If false, correct the statement.
The weight of fluid displaced determines the buoyant force on an object.
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.
