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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Chapter 1.1, Problem 15P
Continuously Compounded Interest. The amount of money P(t) in an interest bearing account in which the principal is compounded continuously at a rate r per annum and in which money is continuously added or subtracted at a rate of k dollars per annum satisfies the differential equation
dpdt=rP+k. (i)
The case k<0 corresponds to paying off a loan, while k>0 corresponds to accumulating wealth by the process of regular contributions to an interest bearing savings account.
Show that the solution to Eq. (i), subject to the initial condition P(0)=P0, is
P=(P0+kr) er t−kr. (ii)
Use Eq. (ii) in Problem 15 to solve Problems 16 and 17.
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Chapter 1 Solutions
Differential Equations: An Introduction to Modern Methods and Applications
Ch. 1.1 - Newton’s Law of Cooling. A cup of hot coffee has...Ch. 1.1 - Blood plasma is stored at . Before it can be...Ch. 1.1 - At 11:09p.m. a forensics expert arrives at a crime...Ch. 1.1 - The rate constant if the population doubles in ...Ch. 1.1 - The field mouse population in Example 3 satisfies...Ch. 1.1 - Radioactive Decay. Experiments show that a...Ch. 1.1 - A radioactive material, such as the isotope...Ch. 1.1 - Classical Mechanics. The differential equation for...Ch. 1.1 - For small, slowly falling objects, the assumption...Ch. 1.1 - Mixing Problems. Many physical systems can be cast...
Ch. 1.1 - Mixing Problems. Many physical systems can be cast...Ch. 1.1 - Mixing Problems. Many physical systems can be cast...Ch. 1.1 - Pharmacokinetics. A simple model for the...Ch. 1.1 - A certain drug is being administered intravenously...Ch. 1.1 - Continuously Compounded Interest. The amount of...Ch. 1.1 - Continuously Compounded Interest. The amount of...Ch. 1.1 - Continuously Compounded Interest. The amount of...Ch. 1.1 - Continuously Compounded Interest. The amount of...Ch. 1.1 - A spherical raindrop evaporates at a rate...Ch. 1.1 - Prob. 20PCh. 1.2 - Phase Line Diagrams. Problems through involve...Ch. 1.2 - Phase Line Diagrams. Problems 1 through 7 involve...Ch. 1.2 - Phase Line Diagrams. Problems through involve...Ch. 1.2 - Phase Line Diagrams. Problems 1 through 7 involve...Ch. 1.2 - Phase Line Diagrams. Problems through involve...Ch. 1.2 - Phase Line Diagrams. Problems 1 through 7 involve...Ch. 1.2 - Phase Line Diagrams. Problems through involve...Ch. 1.2 - Problems 8 through 13 involve equations of the...Ch. 1.2 - Problems 8 through 13 involve equations of the...Ch. 1.2 - Problems 8 through 13 involve equations of the...Ch. 1.2 - Problems 8 through 13 involve equations of the...Ch. 1.2 - Problems 8 through 13 involve equations of the...Ch. 1.2 - Problems through involve equations of the form ....Ch. 1.2 - Direction Fields. In each of problems 14 through...Ch. 1.2 - Direction Fields. In each of problems through...Ch. 1.2 - Direction Fields. In each of problems 14 through...Ch. 1.2 - Direction Fields. In each of problems through...Ch. 1.2 - Direction Fields. In each of problems 14 through...Ch. 1.2 - Direction Fields. In each of problems through...Ch. 1.2 - In each of problems through draw a direction...Ch. 1.2 - In each of problems 20 through 23 draw a direction...Ch. 1.2 - In each of problems through draw a direction...Ch. 1.2 - In each of problems through draw a direction...Ch. 1.2 - Consider the following list of differential...Ch. 1.2 - Consider the following list of differential...Ch. 1.2 - Consider the following list of differential...Ch. 1.2 - Consider the following list of differential...Ch. 1.2 - Consider the following list of differential...Ch. 1.2 - Consider the following list of differential...Ch. 1.2 - Verify that the function in Eq.(11) is a solution...Ch. 1.2 - Show that Asint+Bcost=Rsin(t), where R=A2+B2 and ...Ch. 1.2 - If in the exponential model for population growth,...Ch. 1.2 - An equation that is frequently used to model the...Ch. 1.2 - In addition to the Gompertz equation (see Problem...Ch. 1.2 - A chemical of fixed concentration flows into a...Ch. 1.2 - A pond forms as water collects in a conical...Ch. 1.2 - The Solow model of economic growth (ignoring the...Ch. 1.3 - In each of Problems through , determine the order...Ch. 1.3 - In each of Problems 1 through 6, determine the...Ch. 1.3 - In each of Problems 1 through 6, determine the...Ch. 1.3 - In each of Problems through , determine the order...Ch. 1.3 - In each of Problems through , determine the order...Ch. 1.3 - In each of Problems through , determine the order...Ch. 1.3 - Show that Eq. (10) can be matched to each equation...Ch. 1.3 - Show that Eq. (10) can be matched to each equation...Ch. 1.3 - Show that Eq. (10) can be matched to each equation...Ch. 1.3 - Show that Eq. (10) can be matched to each equation...Ch. 1.3 - Show that Eq. (10) can be matched to each equation...Ch. 1.3 - Show that Eq. (10) can be matched to each equation...Ch. 1.3 - In each of Problems 13 through 20, verify that...Ch. 1.3 - In each of Problems through , verify that each...Ch. 1.3 - In each of Problems through , verify that each...Ch. 1.3 - In each of Problems 13 through 20, verify that...Ch. 1.3 - In each of Problems 13 through 20, verify that...Ch. 1.3 - In each of Problems through , verify that each...Ch. 1.3 - In each of Problems 13 through 20, verify that...Ch. 1.3 - In each of Problems through , verify that each...Ch. 1.3 - In each of Problems 21 through 24, determine the...Ch. 1.3 - In each of Problems through , determine the...Ch. 1.3 - In each of Problems through , determine the...Ch. 1.3 - In each of Problems 21 through 24, determine the...Ch. 1.3 - In each of Problems 25 and 26, determine the...Ch. 1.3 - In each of Problems 25 and 26, determine the...Ch. 1.3 - In Problems 27 through 31, verify that y(t)...Ch. 1.3 - In Problems through , verify that satisfies the...Ch. 1.3 - In Problems through , verify that satisfies the...Ch. 1.3 - In Problems 27 through 31, verify that y(t)...Ch. 1.3 - In Problems through , verify that satisfies the...Ch. 1.3 - Verify that the function (t)=c1et+c2e2t is a...Ch. 1.3 - Verify that the function is a solution of the...Ch. 1.3 - Verify that the function (t)=c1etcos2t+c2etsin2t...
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