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A cube with a mass m = 20 g wettable by water floats on the surface of water. Each side of the cube has length l = 3 cm. The angle of contact between water and glass is zero degree and the surface tension of the water is 7.5 × 10-2 N/m. The distance between the lower face of the cube and the surface of the water is 

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a
20/22 cm
b
2.222 cm
c
2.322 cm
d
2.434 cm

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detailed solution

Correct option is C

FUptthrust= FSurface tension + Weightl2xrg = 4lT + mg (.03)2× 103 × 10 = .009 + .2 9x = .209 x = .02322 m = 2.322 cm

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Similar Questions

Consider the following statements.
(A) Surface tension has same units as force gradient.
(B) Surface tension of a liquid is force per unit length on an imaginary line drawn on the liquid surface.

Select the correct option.
(a) (A) is false, But (B) is true.
(b) Both (A) and (B) are true.
(c) (A) is true, But (B) is false.
(d) Both (A) and (B) are false.


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