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Q.

Water stands at a depth D behind the vertical upstream face of a dam as shown in the figure. The force exerted on the dam by water per unit width is

 

Water stands at a depth D behind the vertical upstream face of a dam as  shown in the figure. The force exerted on the dam by water per unit width is  <img

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a

13ρgD2

b

12ρgD2

c

13ρgD

d

12(ρgD)2

answer is B.

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Detailed Solution

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dA=1(dh) dF=pdA=(ρgh)dh   F=0DdF=12ρgD2

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