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Question

A metal disc of radius 'r' floats on the surface water. The water layer goes down an makes an angle Θ with the vertical edge of disc. If surface tension of water is T, find the weight of metal disc.

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Solution

Weight of the metal disc = Total uipward force

= Upthrust force + force due to surface tension

= Weight of displaced water + TcosӨ(2π)

= W + 2 π r cos(cos Ө T)


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