Repeat problem P10-26 if the displacement y ( t ) of a spring-mass (m=500 gm and k=5 N/m) system shown is given by 0.5 y ¯ ( t ) + 5 y ( t ) = 0 and y ( 0 ) = 10 c m .
Repeat problem P10-26 if the displacement y ( t ) of a spring-mass (m=500 gm and k=5 N/m) system shown is given by 0.5 y ¯ ( t ) + 5 y ( t ) = 0 and y ( 0 ) = 10 c m .
Repeat problem P10-26 if the displacement
y
(
t
)
of a spring-mass (m=500 gm and k=5 N/m) system shown is given by
0.5
y
¯
(
t
)
+
5
y
(
t
)
=
0
and
y
(
0
)
=
10
c
m
.
2. Consider the ODE
u' = ƒ (u) = u² + r
where r is a parameter that can take the values r = −1, −0.5, -0.1, 0.1. For each value of r:
(a) Sketch ƒ(u) = u² + r and determine the equilibrium points.
(b) Draw the phase line.
(d) Determine the stability of the equilibrium points.
(d) Plot the direction field and some sample solutions,i.e., u(t)
(e) Describe how location of the equilibrium points and their stability change as you increase the
parameter r.
(f) Using the matlab program phaseline.m generate a solution for each value of r and the initial
condition u(0) = 0.9. Print and turn in your result for r = −1. Do not forget to add a figure caption.
(g) In the matlab program phaseline.m set the initial condition to u(0) = 1.1 and simulate the ode
over the time interval t = [0, 10] for different values of r. What happens? Why? You do not need to
turn in a plot for (g), just describe what happens.
True or False and why
10
5
Obtain by multiplying matrices the composite coordinate transformation of two transformations, first
x' = (x + y√√2+2)/2
y' =
z'
(x√√2-2√2)/2
z = (-x+y√√2-2)/2
followed by
x"
=
(x'√√2+z'√√2)/2
y" = (-x'y'√√2+2')/2
z" = (x'y'√√2-2')/2.
Chapter 10 Solutions
Introductory Mathematics for Engineering Applications
University Calculus: Early Transcendentals (4th Edition)
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