Let the width of one of the plane surface be w .
We know that the pressure at a depth y is rgy.
There fore the force at that point is given by
df = rgy w dy, on integration we get rgy2w/2 = rgyA/2
therefore the force on each face will be proportional to yA
F1/F2 = ¾. The answer should be (a).
Moderation Team
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