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Q.

The pressure of water at bottom in a lake is 32times that at 2 half depth where the water barometer reads 10 m. The depth of the lake is:

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a

15 m

b

infinite

c

20 m

d

10 m

answer is C.

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Detailed Solution

(P0+hρwg)=32P0+h2ρwg hρwg1-34=P02 ⇒                 h=P0×42×ρwg=105×42×103×10=20m
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