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प्रश्न
Define upthrust and state its S.I. unit.
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उत्तर
The upward force exerted on a body by the fluid in which it is submerged is called the upthrust. Its S.I. unit is 'newton'.
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संबंधित प्रश्न
Which of the following will sink or float on water? (Density of water = 1 g Cm-3)
body C having density 1100 kg m-3
Write an expression for the pressure at a point inside a liquid. Explain the meaning of the symbols used.
Deduce an expression for the pressure at depth inside a liquid.
How does the liquid pressure on a diver change if:
the diver moves to the greater depth
Complete the following sentence :
Pressure at all points at the same depth is ....................
Describe an experiment to show that a body immersed in a liquid appears lighter than it really is.
Complete the following sentence :
Two balls, one of iron and the other of aluminium experience the same upthrust when dipped completely in water if _____________ .
Two spheres A and B, each of volume 100 cm3 is placed on water (density = 1.0 g cm−3). The sphere A is made of wood of density 0.3 g cm−3 and sphere B is made of iron of density 8.9 g cm−3.
- Find:
- The weight of each sphere, and
- The upthrust on each sphere.
- Which sphere will float? Give reason.
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?
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.
