Water is filled to a height $H$ behind a dam of width $w$. The resultant force on dam is ..............
Medium
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(b)
Let us consider a Strip of
length $dx , x$ distance below
the large
$dp = pg x$
$d F=p g x(d x w)$
$\int \limits_0^F d f=\int\limits_0^H p g x w d x$
$F = pgw \frac{ x ^2}{2} \mid _0^{ H }$
$=\frac{ pg w H ^2}{2}$
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