A cube with mass m = 20 g wet table by water floats on the surface of water. Each face of the cube is 3 cm long. If the distance (cm) between the lower face of the cube and the surface of the water in contact with the cube is 4.6/ λ cm, then find λ ? [S.T of water α = 70 dyn/cm, assume contact angle to be θ = 0º]
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(2)
Sol.
FDB of cube
F B = buoyant force, F s = surface tension force
⇒ –(4a) × α + d × g × a 2 h = mg.
⇒ h = 
= 2.3 cm
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