In each of Problems 9 through 16: a. Find the solution of the given initial value problem in explicit 9. 10. form. Gb. Plot the graph of the solution. c. Determine (at least approximately) the interval in which the solution is defined. y'=(1-2x) y2, y(0) = -1/6 y'=(1-2)( WODY

Operations Research : Applications and Algorithms
4th Edition
ISBN:9780534380588
Author:Wayne L. Winston
Publisher:Wayne L. Winston
Chapter5: Sensitivity Analysis: An Applied Approach
Section5.2: The Computer And Sensitivity Analysis
Problem 1P
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9ac

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9.
4.
5.
6.
7.
8.
Problems
In each of Problems 1 through 8, solve the given differential equation.
x²
1. y'=
=
2.
3.
38 CHAPTER 2 First-Order Differential Equations
y
y' + y² sin x = 0
y' = cos(x) cos² (2y)
xy' = (1 - y2) 1/2
x-e-*
38 38 3863
dy
dx
dy
dx
dy
dx
dy
dx
=
=
=
=
1+ y²
al%
y + ey
1-2
y
y' =
=
1+3x²
Зу2 — бу
y(0) = 1
y
In each of Problems 9 through 16:
a. Find the solution of the given initial value problem in explicit
form.
Gb. Plot the graph of the solution.
c. Determine (at least approximately) the interval in which the
solution is defined.
y'= (1-2x) y²,
y(0) = -1/6
10.
y'=(1-2x)/y, y(1) = −2
11. xdx+ye*dy = 0, y(0) = 1
12. dr/d0 = r²/0, r(1) = 2
13. y'=xy³(1+x²)-1/², y(0) = 1 = (
14. y'= 2x/(1+2y), y(2) = 0
= (ut.x)\ li seussed brill 23. Solve the equation o
15. y' = (3x²-e¹)/(2y-5), y(0) = 1
Inilgenotihad to noirulosa aloc= (no
16. sin(2x) dx + cos(3y) dy = 0, y(π/2) = π/3
Some of the results requested in Problems 17 through 22 can be
obtained either by solving the given equations analytically or by
plotting numerically generated approximations to the solutions. Try
to form an opinion about the advantages and disadvantages of each
approach.
150
TO
G 17. Solve the initial value problem
and determine the interval in which the solution is valid.
Hint: To find the interval of definition, look for points where the
integral curve has a vertical tangent.
G 18. Solve the initial value problem
3x²
3y² - 4'
y' =
y(1) = 0
ow (TS) brus (OS)
G 19.
and determine the interval in which the solution is valid.
Hint: To find the interval of definition, look for points where the
integral curve has a vertical tangent.
19. Solve the initial value problem
y' = 2y² + xy², y(0) = 1
and determine where the solution attains its minimum value.
G 20. Solve the initial value problem
2- et
3+2y
y(0) = 0
y' =
=
and determine where the solution attains its maximum value.
G21. Consider the initial value problem
ty(4-y)
y' =
y(0) = yo.
3
a. Determine how the behavior of the solution as t increases
depends on the initial value yo.
b. Suppose that yo= 0.5. Find the time T at which the solution
first reaches the value 3.98.
G 22. Consider the initial value problem
dQ
dt
ty(4- y)
1+t
y' =
y(0) = yo > 0. Cla
a.
Determine how the solution behaves as t →∞.
b. If yo= 2, find the time T at which the solution first reaches
the value 3.99.
c. Find the range of initial values for which the solution lies in
the interval 3.99<y< 4.01 by the time t = 2.
2000 dy
dx
ay+bat bastouldy
cy + d'
where a, b, c, and d are constants.
24. Use separation of variables to solve the differential equation
($) moun
pitulce:
=r(a+bQ), Q(0) = 20,
in 188
where a, b, r, and Qo are constants. Determine how the solution
behaves as t→∞
gabrags
=
Homogeneous Equations. If the right-hand side of the equation
dy/dx f(x, y) can be expressed as a function of the ratio y/x
only, then the equation is said to be homogeneous.¹ Such equations
can always be transformed into separable equations by a change of
the dependent variable. Problem 25 illustrates how to solve first-order
homogeneous equations.
USUDS
The word "homogeneous" has different meanings in different mathematical
contexts. The homogeneous equations considered here have nothing to do with
the homogeneous equations that will occur in Chapter 3 and elsewhere.
N
Transcribed Image Text:30% 9. 4. 5. 6. 7. 8. Problems In each of Problems 1 through 8, solve the given differential equation. x² 1. y'= = 2. 3. 38 CHAPTER 2 First-Order Differential Equations y y' + y² sin x = 0 y' = cos(x) cos² (2y) xy' = (1 - y2) 1/2 x-e-* 38 38 3863 dy dx dy dx dy dx dy dx = = = = 1+ y² al% y + ey 1-2 y y' = = 1+3x² Зу2 — бу y(0) = 1 y In each of Problems 9 through 16: a. Find the solution of the given initial value problem in explicit form. Gb. Plot the graph of the solution. c. Determine (at least approximately) the interval in which the solution is defined. y'= (1-2x) y², y(0) = -1/6 10. y'=(1-2x)/y, y(1) = −2 11. xdx+ye*dy = 0, y(0) = 1 12. dr/d0 = r²/0, r(1) = 2 13. y'=xy³(1+x²)-1/², y(0) = 1 = ( 14. y'= 2x/(1+2y), y(2) = 0 = (ut.x)\ li seussed brill 23. Solve the equation o 15. y' = (3x²-e¹)/(2y-5), y(0) = 1 Inilgenotihad to noirulosa aloc= (no 16. sin(2x) dx + cos(3y) dy = 0, y(π/2) = π/3 Some of the results requested in Problems 17 through 22 can be obtained either by solving the given equations analytically or by plotting numerically generated approximations to the solutions. Try to form an opinion about the advantages and disadvantages of each approach. 150 TO G 17. Solve the initial value problem and determine the interval in which the solution is valid. Hint: To find the interval of definition, look for points where the integral curve has a vertical tangent. G 18. Solve the initial value problem 3x² 3y² - 4' y' = y(1) = 0 ow (TS) brus (OS) G 19. and determine the interval in which the solution is valid. Hint: To find the interval of definition, look for points where the integral curve has a vertical tangent. 19. Solve the initial value problem y' = 2y² + xy², y(0) = 1 and determine where the solution attains its minimum value. G 20. Solve the initial value problem 2- et 3+2y y(0) = 0 y' = = and determine where the solution attains its maximum value. G21. Consider the initial value problem ty(4-y) y' = y(0) = yo. 3 a. Determine how the behavior of the solution as t increases depends on the initial value yo. b. Suppose that yo= 0.5. Find the time T at which the solution first reaches the value 3.98. G 22. Consider the initial value problem dQ dt ty(4- y) 1+t y' = y(0) = yo > 0. Cla a. Determine how the solution behaves as t →∞. b. If yo= 2, find the time T at which the solution first reaches the value 3.99. c. Find the range of initial values for which the solution lies in the interval 3.99<y< 4.01 by the time t = 2. 2000 dy dx ay+bat bastouldy cy + d' where a, b, c, and d are constants. 24. Use separation of variables to solve the differential equation ($) moun pitulce: =r(a+bQ), Q(0) = 20, in 188 where a, b, r, and Qo are constants. Determine how the solution behaves as t→∞ gabrags = Homogeneous Equations. If the right-hand side of the equation dy/dx f(x, y) can be expressed as a function of the ratio y/x only, then the equation is said to be homogeneous.¹ Such equations can always be transformed into separable equations by a change of the dependent variable. Problem 25 illustrates how to solve first-order homogeneous equations. USUDS The word "homogeneous" has different meanings in different mathematical contexts. The homogeneous equations considered here have nothing to do with the homogeneous equations that will occur in Chapter 3 and elsewhere. N
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