In each of Problems 1 through 26: (a) Find the general solution in terms of real functions. (b) From the roots of the characteristics equation, determine whether each critical point of the corresponding dynamical system is asymptotically stable, stable, or unstable, and classify it as to type. (c) Use the general solution obtained in part (a) to find a two parameter family of trajectories X = x 1 i + x 2 j = y i + y ' j of the corresponding dynamical system. Then sketch by hand, or use a computer, to draw a phase portrait, including any straight-line orbits, from this family of trajectories. y ' ' + 2 y ' − 3 y = 0
In each of Problems 1 through 26: (a) Find the general solution in terms of real functions. (b) From the roots of the characteristics equation, determine whether each critical point of the corresponding dynamical system is asymptotically stable, stable, or unstable, and classify it as to type. (c) Use the general solution obtained in part (a) to find a two parameter family of trajectories X = x 1 i + x 2 j = y i + y ' j of the corresponding dynamical system. Then sketch by hand, or use a computer, to draw a phase portrait, including any straight-line orbits, from this family of trajectories. y ' ' + 2 y ' − 3 y = 0
(a) Find the general solution in terms of real functions.
(b) From the roots of the characteristics equation, determine whether each critical point of the corresponding dynamical system is asymptotically stable, stable, or unstable, and classify it as to type.
(c) Use the general solution obtained in part (a) to find a two parameter family of trajectories
X
=
x
1
i
+
x
2
j
=
y
i
+
y
'
j
of the corresponding dynamical system. Then sketch by hand, or use a computer, to draw a phase portrait, including any straight-line orbits, from this family of trajectories.
2.
y
1
Ο
2
3
4
-1
Graph of f
x+
The graph gives one cycle of a periodic
function f in the xy-plane. Which of the
following describes the behavior of f on the
interval 39 x < 41 ?
(Α
B
The function f is
decreasing.
The function f is increasing.
The function f is
decreasing, then increasing.
D
The function f is increasing,
then decreasing.
Depth
(feet)
5-
4-
3-
2.
WW
www
1
D
B
0
10 20 30 40 50 60 70 80
Time (hours)
x
A graph of the depth of water at a pier in the
ocean is given, along with five labeled points
A, B, C, D, and E in the xy-plane. For the
time periods near these data points, a periodic
relationship between depth of water, in feet,
and time, in hours, can be modeled using one
cycle of the periodic relationship. Based on
the graph, which of the following is true?
B
C
The time interval between
points A and B gives the
period.
The time interval between
points A and C gives the
period.
The time interval between
points A and D gives the
period.
The time interval between
points A and E gives the
period.
A certain type of machine produces a number
of amps of electricity that follows a cyclic,
periodically increasing and decreasing
pattern. The machine produces a maximum of
7 amps at certain times and a minimum of 2
amps at other times. It takes about 5 minutes
for one cycle from 7 amps to the next 7 amps
to occur. Which of the following graphs
models amps as a function of time, in
minutes, for this machine?
A
B
C
D
Amps
M
3 4 5 678
Minutes
Amps
w
3 4 5 6 7 8
Minutes
8
Amps-
6+
Amps
y
2345678
Minutes
456 8
Minutes
A Problem Solving Approach To Mathematics For Elementary School Teachers (13th Edition)
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