The surface of water in a water tank on the top of a house is 4 m above the tap level.
The surface of water in a water tank on the top of a house is 4 m above the tap level. Find the pressure of water at the tap when the tap is closed. Is it necessary to specify that the tap is closed ? Take g = 10 m/s 2.
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The pressure P = ρgh
ρ =1000 kg/m³
g =10 m/s²
h =4 m
∴ P = 1000*10*4 N/m² =40000 N/m².
It is necessary to specify that the tap is closed. Otherwise pressure will gradually decrease, as h decrease, because, of the tap is open, the pressure at the tap is atmospheric.
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