Differential Equations: An Introduction to Modern Methods and Applications
3rd Edition
ISBN: 9781118531778
Author: James R. Brannan, William E. Boyce
Publisher: WILEY
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Textbook Question
Chapter 2.7, Problem 1P
Homogeneous Differential Equations. In each of Problem
Determine if the equation is homogeneous. If it is homogeneous, then:
Solve the equation.
Use a computer to draw several integral curves.
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The spread of an infectious disease is often modeled using the following autonomous differential equation:
dI
-
- BI(N − I) − MI,
dt
where I is the number of infected people, N is the total size of the population being modeled, ẞ is a constant determining the rate of
transmission, and μ is the rate at which people recover from infection.
Close
a) (5 points) Suppose ẞ = 0.01, N = 1000, and µ = 2. Find all equilibria.
b) (5 points) For the equilbria in part a), determine whether each is stable or unstable.
c) (3 points) Suppose ƒ(I) = d. Draw a phase plot of f against I. (You can use Wolfram Alpha or Desmos to plot the function, or draw the
dt
function by hand.) Identify the equilibria as stable or unstable in the graph.
d) (2 points) Explain the biological meaning of these equilibria being stable or unstable.
Find the indefinite integral.
Check
Answer:
7x
4 + 1x
dx
show sketch
Chapter 2 Solutions
Differential Equations: An Introduction to Modern Methods and Applications
Ch. 2.1 - In each of Problems 1 through 12, solve the given...Ch. 2.1 - In each of Problems through , solve the given...Ch. 2.1 - In each of Problems 1 through 12, solve the given...Ch. 2.1 - In each of Problems 1 through 12, solve the given...Ch. 2.1 - In each of Problems 1 through 12, solve the given...Ch. 2.1 - In each of Problems through , solve the given...Ch. 2.1 - In each of Problems through , solve the given...Ch. 2.1 - In each of Problems 1 through 12, solve the given...Ch. 2.1 - In each of Problems through , solve the given...Ch. 2.1 - In each of Problems through , solve the given...
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(a) Find the...Ch. 2.1 - In each of Problems 13 through 28: (a) Find the...Ch. 2.1 - In each of Problems through :
(a) Find the...Ch. 2.1 - In Problems through , obtain the requested...Ch. 2.1 - In Problems 29 through 36, obtain the requested...Ch. 2.1 - In Problems through , obtain the requested...Ch. 2.1 - In Problems 29 through 36, obtain the requested...Ch. 2.1 - In Problems through , obtain the requested...Ch. 2.1 - In Problems 29 through 36, obtain the requested...Ch. 2.1 - In Problems through , obtain the requested...Ch. 2.1 - In Problems 29 through 36, obtain the requested...Ch. 2.1 - Solve the equation dydx=ay+bcy+d, where a,b,c, and...Ch. 2.2 - In each of Problems 1 through 12: Draw a direction...Ch. 2.2 - In each of Problems 1 through 12:
Draw a...Ch. 2.2 - In each of Problems 1 through 12:
Draw a...Ch. 2.2 - In each of Problems 1 through 12:
Draw a...Ch. 2.2 - In each of Problems 1 through 12:
Draw a...Ch. 2.2 - In each of Problems 1 through 12:
Draw a...Ch. 2.2 - In each of Problems 1 through 12: Draw a direction...Ch. 2.2 - In each of Problems 1 through 12: Draw a direction...Ch. 2.2 - In each of Problems 1 through 12: Draw a direction...Ch. 2.2 - In each of Problems 1 through 12: Draw a direction...Ch. 2.2 - In each of Problems 1 through 12: Draw a direction...Ch. 2.2 - In each of Problems 1 through 12: Draw a direction...Ch. 2.2 - In each of Problems 13 through 20, find the...Ch. 2.2 - In each of Problems 13 through 20, find the...Ch. 2.2 - In each of Problems 13 through 20, find the...Ch. 2.2 - In each of Problems 13 through 20, find the...Ch. 2.2 - In each of Problems 13 through 20, find the...Ch. 2.2 - In each of Problems 13 through 20, find the...Ch. 2.2 - In each of Problems 13 through 20, find the...Ch. 2.2 - In each of Problems 21 through 23:
Draw a...Ch. 2.2 - In each of Problems 21 through 23:
Draw a...Ch. 2.2 - In each of Problems 21 through 23: Draw a...Ch. 2.2 - In each of Problems 21 through 23:
Draw a...Ch. 2.2 - In each of Problems 24 through 26:
Draw a...Ch. 2.2 - In each of Problems 24 through 26: Draw a...Ch. 2.2 - In each of Problems 24 through 26:
Draw a...Ch. 2.2 - Consider the initial value problem
Find the...Ch. 2.2 - Consider the initial value problem
Find the value...Ch. 2.2 - Consider the initial value problem...Ch. 2.2 - Find the value of y0 for which the solution of the...Ch. 2.2 - Consider the initial value problem
Find the value...Ch. 2.2 - Show that all solutions of [Eq. (36) of the text]...Ch. 2.2 - Show that if andare positive constants, and b is...Ch. 2.2 - In each of Problems 34 through 37, construct a...Ch. 2.2 - In each of Problems 34 through 37, construct a...Ch. 2.2 - In each of Problems 34 through 37, construct a...Ch. 2.2 - In each of Problems 34 through 37, construct a...Ch. 2.2 - Consider the initial value problem...Ch. 2.2 - Variation of Parameters. Consider the following...Ch. 2.2 - In each of Problems 40 through 43 use the method...Ch. 2.2 - In each of Problems 40 through 43 use the method...Ch. 2.2 - In each of Problems 40 through 43 use the method...Ch. 2.2 - In each of Problems 40 through 43 use the method...Ch. 2.3 - Consider a tank used in certain hydrodynamic...Ch. 2.3 - A tank initially contains 200L of pure water. A...Ch. 2.3 - A tank originally contains gal of fresh water....Ch. 2.3 - A tank with a capacity of originally contains of...Ch. 2.3 - A tank contains of water and of salt. Water...Ch. 2.3 - Suppose that a tank containing a certain liquid...Ch. 2.3 - An outdoor swimming pool loses 0.05 of its water...Ch. 2.3 -
Cholesterol is produced by the body for the...Ch. 2.3 - Imagine a medieval world. In this world a Queen...Ch. 2.3 - Suppose an amount is invested at an annual rate...Ch. 2.3 - A young person with no initial capital invests ...Ch. 2.3 - A homebuyer can afford to spend no more than on...Ch. 2.3 - A recent college graduate borrows 100,000 at an...Ch. 2.3 - A Difference Equation. In this problem, we...Ch. 2.3 - An important tool in archaeological research is...Ch. 2.3 - The population of mosquitoes in a certain area...Ch. 2.3 - Suppose that a certain population has growth rate...Ch. 2.3 - Suppose that a certain population satisfies the...Ch. 2.3 - Newtons law of cooling states that the temperature...Ch. 2.3 - Heat transfer from a body to its surrounding by...Ch. 2.3 - Consider a lake of constant volume containing at...Ch. 2.3 - A ball with mass 0.25 kg is thrown upward with...Ch. 2.3 - Assume that conditions are as Problemexcept that...Ch. 2.3 - Assume that conditions are as in Problem 22 except...Ch. 2.3 - A skydiver weighing 180 lb (including equipment)...Ch. 2.3 - A rocket sled having an initial speed of mi/h is...Ch. 2.3 - A body of constant mass is projected vertically...Ch. 2.3 - Prob. 28PCh. 2.3 - Prob. 29PCh. 2.3 - A mass of 0.40 kg is dropped from rest in a medium...Ch. 2.3 - Suppose that a rocket is launched straight up from...Ch. 2.3 - Let and , respectively, be the horizontal and...Ch. 2.3 - A more realistic model (than that in Problem 32)...Ch. 2.3 - Brachistochrone Problem. One of the famous...Ch. 2.4 - Existence and uniqueness of Solutions. In each of...Ch. 2.4 - Existence and uniqueness of Solutions. In each of...Ch. 2.4 - Existence and uniqueness of Solutions. In each of...Ch. 2.4 - Existence and uniqueness of Solutions. In each of...Ch. 2.4 - Existence and uniqueness of Solutions. In each of...Ch. 2.4 - Existence and uniqueness of Solutions. In each of...Ch. 2.4 - In each of Problem through, state where in -...Ch. 2.4 - In each of Problem through, state where in -...Ch. 2.4 - In each of Problem through, state where in -...Ch. 2.4 - In each of Problem 7 through 12, state where in...Ch. 2.4 - In each of Problem through, state where in -...Ch. 2.4 - In each of Problem through, state where in -...Ch. 2.4 - Consider the initial value problem y=y1/3,y(0)=0...Ch. 2.4 -
Verify that both and are solutions of the...Ch. 2.4 - Dependence of Solutions on Initial Conditions. In...Ch. 2.4 - Dependence of Solutions on Initial Conditions. In...Ch. 2.4 - Dependence of Solutions on Initial Conditions. In...Ch. 2.4 - Dependence of Solutions on Initial Conditions. In...Ch. 2.4 - In each of Problem 19 through 22, draw a direction...Ch. 2.4 - In each of Problem 19 through 22, draw a direction...Ch. 2.4 - In each of Problem through, draw a direction...Ch. 2.4 - In each of Problem through, draw a direction...Ch. 2.4 -
Show that is a solution of and that is also a...Ch. 2.4 - Show that if y=(t) is a solution of y+p(t)y=0,...Ch. 2.4 - Let y=y1(t) be a solution of y+p(t)y=0, (i) and...Ch. 2.4 -
Show that the solution (7) of the general...Ch. 2.4 - Discontinuous Coefficients. Linear differential...Ch. 2.4 - Discontinuous Coefficients. Linear differential...Ch. 2.4 - Consider the initial value problem
...Ch. 2.5 - Suppose that a certain population obeys the...Ch. 2.5 - Another equation that has been used to model...Ch. 2.5 - (a) Solve the Gompertz equation subject to the...Ch. 2.5 - A pond forms as water collects in a conical...Ch. 2.5 - Consider a cylindrical water tank of constant...Ch. 2.5 - Epidemics. The use of mathematical methods to...Ch. 2.5 - Epidemics. The use of mathematical methods to...Ch. 2.5 - Epidemics. The use of mathematical methods to...Ch. 2.5 - Chemical Reactions. A second order chemical...Ch. 2.5 - Bifurcation Points. For an equation of the form...Ch. 2.5 - Bifurcation Points. For an equation of the form
...Ch. 2.5 - Bifurcation Points. For an equation of the form...Ch. 2.6 - Exact Equations. In each of Problem through...Ch. 2.6 - Exact Equations. In each of Problem 1 through 12:...Ch. 2.6 - Exact Equations. In each of Problem through...Ch. 2.6 - Exact Equations. In each of Problem through...Ch. 2.6 - Exact Equations. In each of Problem 1 through 12:...Ch. 2.6 - Exact Equations. In each of Problem 1 through 12:...Ch. 2.6 - Exact Equations. In each of Problem through...Ch. 2.6 - Exact Equations. In each of Problem 1 through 12:...Ch. 2.6 - Exact Equations. In each of Problem 1 through 12:...Ch. 2.6 - Exact Equations. In each of Problem through...Ch. 2.6 - Exact Equations. In each of Problem through...Ch. 2.6 - Exact Equations. In each of Problem through...Ch. 2.6 - In each of Problem and , solve the given initial...Ch. 2.6 - In each of Problem 13 and 14, solve the given...Ch. 2.6 - In each of Problem 15 and 16, find the value of b...Ch. 2.6 - In each of Problem 15 and 16, find the value of b...Ch. 2.6 - Assume that Eq. (6) meets the requirements of...Ch. 2.6 - Show that any separable equation is also exact.
Ch. 2.6 - Integrating Factor. In each of Problem through...Ch. 2.6 - Integrating Factor. In each of Problem through...Ch. 2.6 - Integrating Factor. In each of Problem 19 through...Ch. 2.6 - Integrating Factor. In each of Problem through...Ch. 2.6 - Show that if (NxMy)/M=Q, where Q is function of y...Ch. 2.6 - Show that if , where depends on the quantity ...Ch. 2.6 - In each of Problem 25 through 31: Find an...Ch. 2.6 - In each of Problem through:
Find an integrating...Ch. 2.6 - In each of Problem 25 through 31: Find an...Ch. 2.6 - In each of Problem 25 through 31: Find an...Ch. 2.6 - In each of Problem through:
Find an integrating...Ch. 2.6 - In each of Problem 25 through 31: Find an...Ch. 2.6 - In each of Problem 25 through 31: Find an...Ch. 2.6 - Use the integrating factor (x,y)=[xy(2x+y)]1 to...Ch. 2.7 - Homogeneous Differential Equations. In each of...Ch. 2.7 - Homogeneous Differential Equations. In each of...Ch. 2.7 - Homogeneous Differential Equations. In each of...Ch. 2.7 - Homogeneous Differential Equations. In each of...Ch. 2.7 - Homogeneous Differential Equations. In each of...Ch. 2.7 - Homogeneous Differential Equations. In each of...Ch. 2.7 - Homogeneous Differential Equations. In each of...Ch. 2.7 - Homogeneous Differential Equations. In each of...Ch. 2.7 - Homogeneous Differential Equations. In each of...Ch. 2.7 - Homogeneous Differential Equations. In each of...Ch. 2.7 - In problem 11 and 12, solve the given initial...Ch. 2.7 - In problem and, solve the given initial value...Ch. 2.7 - In each of Problems 13 through 22: Write the...Ch. 2.7 - In each of Problems through:
Write the Bernoulli...Ch. 2.7 - In each of Problems through:
Write the Bernoulli...Ch. 2.7 - In each of Problems through:
Write the Bernoulli...Ch. 2.7 - In each of Problems through:
Write the Bernoulli...Ch. 2.7 - In each of Problems 13 through 22: Write the...Ch. 2.7 - In each of Problems through:
Write the Bernoulli...Ch. 2.7 - In each of Problems through:
Write the Bernoulli...Ch. 2.7 - In each of Problems 13 through 22: Write the...Ch. 2.7 - In each of Problems through:
Write the Bernoulli...Ch. 2.7 - A differential equation of the form...Ch. 2.7 - Mixed Practice. In each of Problems 24 through 36:...Ch. 2.7 - Mixed Practice. In each of Problems ...Ch. 2.7 - Mixed Practice. In each of Problems ...Ch. 2.7 - Mixed Practice. In each of Problems 24 through 36:...Ch. 2.7 - Mixed Practice. In each of Problems 24 through 36:...Ch. 2.7 - Mixed Practice. In each of Problems ...Ch. 2.7 - Mixed Practice. In each of Problems 24 through 36:...Ch. 2.7 - Mixed Practice. In each of Problems 24 through 36:...Ch. 2.7 - Mixed Practice. In each of Problems ...Ch. 2.7 - Mixed Practice. In each of Problems ...Ch. 2.7 - Mixed Practice. In each of Problems ...Ch. 2.7 - Mixed Practice. In each of Problems ...Ch. 2.7 - Mixed Practice. In each of Problems 24 through 36:...Ch. 2.P1 - Constant Effort Harvesting. At a given level of...Ch. 2.P1 - Constant Yield Harvesting. In this problem, we...Ch. 2.P2 - Derive Eq. (3) from Eqs. (1) and (2) and show that...Ch. 2.P2 - Additional processes due to biotic and abiotic...Ch. 2.P2 - Show that when , the source has an infinite...Ch. 2.P2 - Assume the following values for the parameters;...Ch. 2.P2 - Effects of Partial Source Remediation.
Assume...Ch. 2.P3 - Simulate five sample trajectories of Eq. (1) for...Ch. 2.P3 - Use the difference equation (4) to generate an...Ch. 2.P3 - VarianceReduction by Antithetic Variates. A simple...
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