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Force necessary to pull a circular plate...

Force necessary to pull a circular plate of 5cm radius from water surface for which surface tension is 75 dynes/cm, is ?

A

30 dyne

B

60 dynes

C

750 dynes

D

`750 pi` dynes

Text Solution

Verified by Experts

The correct Answer is:
D
`F = S pi d = 75 xx pi 10 = 750 pi` dynes
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Knowledge Check

  • Force necessary to pull a circular plate of 5cm raduis from water surface for which surface tension is 75 dynes/cm, is

    A
    30 dynes
    B
    60 dynes
    C
    750 dynes
    D
    750 `pi` dynes

  • Consider a circular plate of radius 5 cm placed on the surface of a water body such that their planes are parallel. Force necessary to pull the circular plate from water surface for which surface tension is 75 "dyne" cm^(-1) is:

    A
    30 dyne
    B
    60 dyne
    C
    750 dyne
    D
    `750 pi` dyne

  • The force required to take away a flat circular plate of radius 2 cm from the surface of water, will be (the surface tension of water is 70 dyne/cm)

    A
    `280 pi` dyne
    B
    `250 pi ` dyne
    C
    `140 pi` dyne
    D
    `210 pi ` dyne