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What is buoyancy and centre of buoyancy?...

What is buoyancy and centre of buoyancy?

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The upward thrust acting on the body immersed in a liquid is called buoyant force or simply bouyancy. The centre of bouyancy is the centre of gravity of the displaced liquid by the body when immersed in a liquid.
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Knowledge Check

  • The centre of gravity and the centre of buoyancy of a floating body, in stable equilibrium, (i) are always same. (ii) are always along a same vertical line.

    A
    Only (i) is true
    B
    Only (ii) is true
    C
    Both (i) and (ii) are true
    D
    Both (i) and (ii) are false

  • In order that a floating object be in a stable equilibrium its centre of buoyancy should be

    A
    vertical below its centre of gravity
    B
    horizontally inline with its centre of gravity
    C
    vertically above its centre of gravity
    D
    may be anywhere

  • A wooden rod of a uniform cross section and of length 120 cm is hinged at the bottom of the tank which is filled with water to a height of 40 cm . In the equilibrium position, the rod makes an angle of 60^@ with the vertical. The centre of buoyancy is located on the rod at a distance (from the hinge) of

    A
    `20cm`
    B
    `40cm`
    C
    `60cm`
    D
    `75cm`

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    An aluminium sphere is dipped into water at 10^@C .If the temperature is increased, the force of buoyancy

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