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Question

Water is filled to a height H behind a dam of width w. The resultant force on dam is:

A
pgwH2
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B
12pgwH2
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C
2pgwH2
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D
4pgwH2
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Solution

The correct option is B 12pgwH2
R.E.F image
Let us consider a Strip of
length dx, x distance below
the large
dp=pgx
dF=pgx(dxw)
F0df=H0pgxwdx
F=pgwx22|H0
=pgwH22
Option (B)

1164441_1106414_ans_da58df2cf0f74cd2a565e045d5fc3659.jpg

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