Presure at the bottom of a tank is 3P, where P is the atmospheric pressure. If the water is drawn out till the level of water is lowered to one fifth, then what is the pressure at the bottom of the tank?
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Pressure at bottom of tank is 3P.
Pressure due to atmosphere = P.
So, Pressure due to water = 3P - P = 2P...
Also, P = h*density*g
Thus, P is directly proportional to h
If new height is h - h/5 i.e. 4h/5....
Then, new pressure due to water = 2P * 4/5
= 8P/5
So, Pressure at bottom of the tank = P + 8P/5
= 13P/5....
Pressure due to atmosphere = P.
So, Pressure due to water = 3P - P = 2P...
Also, P = h*density*g
Thus, P is directly proportional to h
If new height is h - h/5 i.e. 4h/5....
Then, new pressure due to water = 2P * 4/5
= 8P/5
So, Pressure at bottom of the tank = P + 8P/5
= 13P/5....
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