initial commit / add all books

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diff --git a/3720/CH2/EX2.1/Ex2_1.sce b/3720/CH2/EX2.1/Ex2_1.sce
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+// Example 2_1

+clc;clear;funcprot(0);

+// Given values

+p=100; // The pressure of air in kPa

+T=25+273; // The temperature of air in K

+R=0.287; // The gas constant of air in (kPa.m^3)/(kg.K)

+

+//Calculation

+

+rho=p/(R*T); // From ideal gas relation

+printf('The density of air,rho =%0.2f kg/m^3\n',rho);

+

+rho_1=1000; // Density of water in kg/m^3

+SG=rho /rho_1; // The specific gravity of air

+printf('The specific gravity of air,SG =%0.5f \n',SG);

+

+V=4*5*6; // The volume of air in m^3

+m=rho*V; // The mass of air in the room in kg

+printf('The mass of air,m =%0.0f kg\n',m);

diff --git a/3720/CH2/EX2.2/Ex2_2.sce b/3720/CH2/EX2.2/Ex2_2.sce
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+// Example 2_2

+clc;clear;funcprot(0);

+//Properties

+P_sat=4.25;//The vapor pressure of water at 30°C in KPa

+//Analysis

+P_min=P_sat;

+printf('The minimum pressure allowed in the system to avoid cavitation P_min=%0.2f kPa\n',P_min);

diff --git a/3720/CH2/EX2.3/Ex2_3.sce b/3720/CH2/EX2.3/Ex2_3.sce
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index 000000000..cfea0bd1f
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+// Example 2_3

+clc;clear;funcprot(0);

+//Given values

+T_1=20;// degree celsius

+T_2=50;//degree celsius

+P_1=1;// atm

+P_2=100;//atm

+rho_1=998.0;// The density of water in kg/m^3

+

+//Properties

+//The coefficient of volume expansion at the average temperature T_avg=35°C

+beta=0.337*10^-3;// k^-1

+alpha=4.80*10^-5;//The isothermal compressibility of water in atm^-1

+

+// Calculation

+//(a)

+gradT=(T_2-T_1);// K

+gradrho=-(beta*rho_1*gradT);// The change in density in kg/m^3

+rho_2=rho_1+gradrho;// The density of water at 50°C and 1 atm in kg/m^3

+printf('The density of water at 50°C and 1 atm is rho_2 =%0.0f kg/m^3\n',rho_2);

+//(b)

+gradP=(P_2-P_1);

+gradrho=alpha*rho_1*gradP;// kg/m^3

+rho_2=rho_1+gradrho;//The density of water at 100 atm and 20°C in kg/m^3

+printf('The density of water at 100 atm and 20°C is rho_2 =%0.1f kg/m^3\n',rho_2);

diff --git a/3720/CH2/EX2.4/Ex2_4.sce b/3720/CH2/EX2.4/Ex2_4.sce
new file mode 100644
index 000000000..74e2c7565
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+++ b/3720/CH2/EX2.4/Ex2_4.sce
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+// Example 2_4

+clc;clear;funcprot(0);

+// Given values

+l=0.0015; // Gap between two cylinders in m

+T=1.8; // Torque in N.m

+L=.4; //  Length  in m

+R=.06; // Outer radius of inner cylinder in m

+n=300/60; // Number of revolutions per unit time (seconds)

+

+//Calculation

+mu=(T*l/(4*%pi^2*R^3*n*L)); // Viscosity of the fluid in N.s/m^2

+printf('The viscosity of the fluid,mu =%0.3f N.s/m^2\n',mu);

diff --git a/3720/CH2/EX2.5/Ex2_5.sce b/3720/CH2/EX2.5/Ex2_5.sce
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index 000000000..3a1d407a6
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+// Example 2_5

+clc;clear;funcprot(0);

+// Given values

+T=20;// degree celsius

+sigma_s=0.073; // the surface tension of water in N/m

+phi=0; // the contact angle of water with glass in degree

+rho=1000;// kg/m^3

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

+R=0.3*10^-3; // Radius of glass tube in m

+

+//Calculation

+h=((2*sigma_s)/(rho*g*R))*cos(phi);// the capillary rise of water in m

+h=h*100;// m to cm

+printf('The capillary rise of water in a tube h=%0.1f cm\n',h);