Pressure at the bottom of tank of water is 3P, where P is atmospheric pressure. If the water is drawn out till the level of water is lowered by one-fifth, then the pressure at the bottom of the tank is:
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a
2P
b
13 P/5
c
8 P/5
d
4 P/5
answer is B.
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Detailed Solution
3P=P+hρwg ⇒ hρwg=2P When the water is drawn out the pressure at bottom =P+h-h5ρwg=P+45hρwg =P+45(2P)=13P5
Pressure at the bottom of tank of water is 3P, where P is atmospheric pressure. If the water is drawn out till the level of water is lowered by one-fifth, then the pressure at the bottom of the tank is: