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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=10ms^-2`

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B, D
a. Given `h=4m,
`g=10m/s^2`
`rho=10^3 kg/m^3`
`p=hrhog=4xx10^3xx10`
`=40000N/m^2`

b. It is necessary to specify that the tap is closed. Otherwise pressure will gradualyldecrease, as h decreases the tap is open and the pressure at the tap is atmospheric.
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