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If the force required to pull out a glas...

If the force required to pull out a glass plate of length 9.8 cm and thickness 2 mm from a liquid is 0.6 gmwt. The surface tension of water is `Nm^(-1)`

A

`2.94xx10^(-3)`

B

`29.4xx10^(3)`

C

`29.4xx10^(-2)`

D

`29.4xx10^(-3)`

Text Solution

Verified by Experts

The correct Answer is:
D
`T=(F)/(2(l+t))`
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Knowledge Check

  • 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

  • The minimum force required to separate a light glass plate of perimeter 5m from a water surface is (Given surface tension of water = 70 xx 10^(-3) N/m)

    A
    `350 xx 10^(-3)`N
    B
    `75 xx 10^(-3)`N
    C
    `100 xx 10^(-3)`N
    D
    `150 xx 10^(-3)` N

  • The force required to lift a circular flat plate of radius 5 cm on the surface of water is: (Surface tension of water is 75 dyne/cm):-

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