A thin metal disc of radius r floats on water surface and bends the surface downwards along the perimeter making an angle θ θ with vertical edge of the disc. If the disc displaces a weight of water W and surface tension of water is T, then the weight of metal disc is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
Weight of metal disc = total upward force
= upthrust force + force due to surface tension
= weight of displaced water + T cos θ θ (2 π π r)
= W + 2 π π rT cos θ θ
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