Answer to Question #97392 in Field Theory for abdalla

Question #97392
Water is forced out of a fire extinguisher by air pressure, as shown in Figure. How much gauge air pressure in the tank (above atmospheric) is required for the water jet to have a speed of 30.0 m/s when the water level in the tank is 0.500 m below the nozzle?
1
Expert's answer
2019-10-28T10:57:43-0400

The gauge air pressure in the tank:

"p=\\rho gh+0.5\\rho v^2"

"p=1000( 9.8\\cdot 0.5+0.5(30)^2)=455000\\ Pa=455\\ kPa"


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