A thin metal disc of radius r floats on ...

A thin metal disc of radius `r` floats on water surface and bends the surface downwards along the perimeter making an angle `theta` with vertical edge of the disc of the disc. If the disc dispplaces a weight of water `W` and surface tension of water is `T`, then the weight of metal disc is

`2pi T + W`

`2pi T cos theta-W`

`2pi rT cos theta + W`

`W-2pi rT cos theta`

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