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Bernoulli's Principle

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Question

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? $T a k e g = 10 m s^{- 2}$ .

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Solution

$P = P_{o} + ρ g h (10^{3} \times 10 \times 4) = 10^{5} N / m^{2} + 4 \times 10^{4} N / m^{2} = 1.4 \times 10^{5} p a = 1.4 b a r$

When tap is opened, then the pressure at tap is equal to the pressure of atmosphere. That is $P = 1 b a r$

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