This problem Builds upon itself- what are the formulas necessary to solve it? Wh

Question

This problem Builds upon itself- what are the formulas necessary to solve it?
What is the gauge pressure just behind a closed faucet that supplies water from a water tower whose top water surface is 20m above?
What is the absolute pressure just behind the faucet after the valve is opened?
What is the speed the water exits the faucet? This problem Builds upon itself- what are the formulas necessary to solve it?
What is the gauge pressure just behind a closed faucet that supplies water from a water tower whose top water surface is 20m above?
What is the absolute pressure just behind the faucet after the valve is opened?
What is the speed the water exits the faucet?
What is the gauge pressure just behind a closed faucet that supplies water from a water tower whose top water surface is 20m above?
What is the absolute pressure just behind the faucet after the valve is opened?
What is the speed the water exits the faucet?

Explanation / Answer

Gauge pressure, P = dgh,

where d is density of water = 1000 kg/m3

g is gravity = 9.8 m/s^2

h is height = 20 m

So, Pressure = 1000*9.8*20 = 196 kPa

Absolute pressure = gauge pressure + atmospheric pressure

= 196 + 101.325 kPa

= 297.325 kPa

Speed of water = sqrt(2gh)

= 19.8 m/s2

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