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0 votes
21.1k views
in Physics by (2.4k points)
A thin metal disc of radius r floats on water surface and bends the surface downwards along  the perimeter making an angle ø with the  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) 2pie rT +W

B) 2pie r T cosø +W

C)2 pie r T cosø -W

D ) w-2 pie r T cosø

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2 Answers

0 votes
by (10.9k points)

Option (B)

Explanation

Here weight of the disc is balance by upthrust due to water as well as upward component of surface tension.

Hence weight of the disc

= weight of displaced water + upward force due to surface tension

= W + 2πrTcosø

0 votes
by (20 points)

t=2picos theta r ro g+ q

solution

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