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+// Example 5_7

+clc;clear;funcprot(0);

+// Given values

+P_atm=101.3;// The atmospheric pressure in kPa;

+rho=750;//The density of gasoline in kg/m^3

+g=9.81;//m/s^2

+z_1=0.75;//  m

+z_3=2.75;// m

+D=(5/1000);// m

+

+// Calculation

+//(a)

+V_2=sqrt(2*g*z_1);

+A=(%pi*D^2)/4;//The cross-sectional area of the tube in m^2

+v=V_2*A*1000;//The flow rate of gasoline in  L/s

+V=4;// Volume of gasoline in litre

+gradt=V/v;

+printf('(a)The time needed to siphon 4 L of gasoline from the tank,gradt=%0.1f s\n',gradt);

+//(b)

+P_3=P_atm-((rho*g*z_3)/1000);// kPa

+printf('(b)The pressure at point 3,P_3=%0.1f kPa\n',P_3);