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Est120

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i really can't understand the answer of this question, is the question 1.3 in fluid mechanics by Frank ,M White

For the triangular element in Fig P1.3, show that a tilted free liquid surface, in contact with an atmosphere at pressure pa, must undergo shear stress and hence begin to flow.

i repeat i know the answer ,there is a solutionary of this book but i CANT understand why does the pressures at the bottom of the triangle are higher ,and why did the solutionary did n0t put Area in the formula since F=P*A ,

someone please explain this

For the triangular element in Fig P1.3, show that a tilted free liquid surface, in contact with an atmosphere at pressure pa, must undergo shear stress and hence begin to flow.

i repeat i know the answer ,there is a solutionary of this book but i CANT understand why does the pressures at the bottom of the triangle are higher ,and why did the solutionary did n0t put Area in the formula since F=P*A ,

someone please explain this

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