initial commit / add all books

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diff --git a/2411/CH1/EX1.10/Ex1_10.sce b/2411/CH1/EX1.10/Ex1_10.sce
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+// Scilab Code Ex1.10: : Page-14 (2008)
+clc; clear;
+m1 = 1200;    // Mass of the car, kg
+m2 = 3600;    // Mass of the truck, kg
+u1 = 30;    // Speed of the car, m/s
+u2 = 20;    // Speed of the truck, m/s
+theta = 60;    // Direction of motion of the truck w.r.t. that of car, degree
+// As m1*u1 + m2*u2 = (m1 + m2)*v, solving for v along x and y directions
+v_x = (m1*u1 + m2*u2*cosd(theta))/(m1 + m2);    // Common speed along x-direction, m/s
+u1 = 0;    // The speed of the car after interlocking with the truck, m/s
+v_y = (m1*u1 + m2*u2*sind(theta))/(m1 + m2);    // Common speed along y-direction, m/s
+v = sqrt(v_x^2 + v_y^2);    // Common speed of the car-truck system, m/s
+theta = atand(v_y/v_x);    // Direction of common velocity w.r.t. that of car, degree
+printf("\nThe common speed of the car-truck system = %4.1f m/s", v);
+printf("\nThe direction of common velocity = %4.1f degree north of east", theta);
+
+// Result 
+// The common speed of the car-truck system = 19.8 m/s
diff --git a/2411/CH1/EX1.11/Ex1_11.sce b/2411/CH1/EX1.11/Ex1_11.sce
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index 000000000..a639dfba7
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+++ b/2411/CH1/EX1.11/Ex1_11.sce
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+// Scilab Code Ex1.11: Page-14 (2008)
+clc; clear;
+v1 = 20;    // Velocity of first piece, m/s
+v2 = 30;    // Velocity of second piece, m/s
+// From conservation of momentum, in x-direction 
+// m*v1*cosd(0)+m*v2*cosd(45)+m*v3*cosd(theta) = 0, solving for v3*cosd(theta)
+v3_cos_theta = -(v1*cosd(0)+v2*cosd(45));    // x-component of v3 along theta, m/s
+// From conservation of momentum, in y-direction 
+// m*v1*sind(0)-m*v2*sind(45)+m*v3*sind(theta) = 0, solving for v3*sind(theta)
+v3_sin_theta = -(v1*sind(0)-v2*sind(45));    // y-component of v3 along theta, m/s
+theta = atand(v3_sin_theta/v3_cos_theta);    // Direction of velocity of third piece, degree
+v3 = -(v1*cosd(0)+v2*cosd(45))/cosd(theta+180);    // Velocity of third piece, m/s
+printf("\nThe velocity of third piece is %4.1f m/s towards %d degree north of west", v3, ceil(theta+180));
+
+// Result 
+// The velocity of third piece is 46.4 m/s towards 153 degree north of west 
diff --git a/2411/CH1/EX1.5/Ex1_5.sce b/2411/CH1/EX1.5/Ex1_5.sce
new file mode 100755
index 000000000..e66a2cbbf
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+++ b/2411/CH1/EX1.5/Ex1_5.sce
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+// Scilab Code Ex1.5: Page-11 (2008)
+clc; clear;
+m1 = 2;    // Mass of first body, kg
+m2 = 1;    // Mass of second body, kg
+F = 3;    // The horizontal force applied to the mass m1, N
+F_prime = m2/(m1 + m2)*F;    // Force of contact between m1 and m2, N
+printf("\nThe force of contact between m1 and m2 = %3.1f N", F_prime);
+F_prime = m1/(m1 + m2)*F;    // Force of contact when F is applied to m2, N
+printf("\nThe force of contact when F is applied to m2 = %3.1f N", F_prime);
+
+// Result 
+// The force of contact between m1 and m2 = 1.0 N
+// The force of contact when F is applied to m2 = 2.0 N 
diff --git a/2411/CH1/EX1.6/Ex1_6.sce b/2411/CH1/EX1.6/Ex1_6.sce
new file mode 100755
index 000000000..bd48ae4e9
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+++ b/2411/CH1/EX1.6/Ex1_6.sce
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+// Scilab Code Ex1.6: Page-12 (2008)
+clc; clear;
+v = 1;    // Let the speed of the ball B be unity, unit
+v_prime = v/2;    // Speed of the ball after the collision, unit
+theta = atand(v_prime/v);    // The direction of motion of the ball A after collision, degree
+printf("\nThe direction of motion of the ball after collision = %2.0f degree", theta);
+
+// Result 
+// The direction of motion of the ball after collision = 27 degree 
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diff --git a/2411/CH1/EX1.9/Ex1_9.sce b/2411/CH1/EX1.9/Ex1_9.sce
new file mode 100755
index 000000000..ae996ba20
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+++ b/2411/CH1/EX1.9/Ex1_9.sce
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+// Scilab Code Ex1.9: Page-14 (2008)
+clc; clear;
+omega1 = 500;    // Angular speed of rotating shaft, r.p.m.
+omega2 = 0;    // Initial angular speed of the second wheel, r.p.m.
+I = 1;    // For simplicity assume moment of ineria of the wheels to be unity
+I1 = I, I2 = I;    // Moment of inertia of wheels A and B, kg-Sq.m
+// As I1*omega1 + I2*omega2 = (I1 + I2)*omega, solving for omega
+omega = (I1*omega1 + I2*omega2)/(I1 + I2);    // Angular speed of the combination of two wheels, r.p.m.
+printf("\nThe angular speed of the combination of two wheels = %3.0f r.p.m.", omega);
+
+// Result 
+// The angular speed of the combination of two wheels = 250 r.p.m. 
\ No newline at end of file