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प्रश्न
Write an expression for the pressure at a point inside a liquid. Explain the meaning of the symbols used.
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उत्तर
P = Po + h ρ g
Here, P = Pressure exerted at a point in the liquid
Po = Atmospheric pressure
h = Depth of the point below the free surface
`ρ` = Density of the liquid
g = Acceleration due to gravity
संबंधित प्रश्न
Explain why an iron needle sinks in water, but a ship made of iron floats on water.
In what direction and at what point does the buoyant force on a body due to a liquid act?
What is the cause of upthrust? At which point can it be considered to act?
A body weighs 450 gf in air and 310 gf when completely immersed in water. Find
(i) The volume of the body,
(ii) The loss in weight of the body, and
(iii) The upthrust on the body.
State the assumption made in part (i).
What is the centre of buoyancy? State its position for a floating body with respect to the centre of gravity of the body.
Two identical pieces, one of ice (density = 900kg per meter cube) and other wood (density = 300kg per meter cube) float on water.
- Which of the two will have more volume submerged inside water
- Which of two will experience more upthrust due to water.
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?
Write the SI units of Buoyant force
What do you mean by buoyancy?
State whether true or false. If false, correct the statement.
The weight of fluid displaced determines the buoyant force on an object.
