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I understand the explanation of tios problem, except the fact that the force acting upwards bacause of surface pressure is [tex]2 \pi r \gamma_{WG} cos(180 - \theta)[/tex]. Why is that?

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I understand the explanation of tios problem, except the fact that the force acting upwards bacause of surface pressure is [tex]2 \pi r \gamma_{WG} cos(180 - \theta)[/tex]. Why is that?

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Astronuc

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