Calculus, Early Transcendentals, Single Variable Loose-Leaf Edition Plus MyLab Math with Pearson eText - 18-Week Access Card Package
Calculus, Early Transcendentals, Single Variable Loose-Leaf Edition Plus MyLab Math with Pearson eText - 18-Week Access Card Package
3rd Edition
ISBN: 9780136207764
Author: Briggs, William, Cochran, Lyle, Gillett, Bernard, SCHULZ, Eric
Publisher: PEARSON
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Differential Equations
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Chapter 9.4, Problem 27E

Newton’s Law of Cooling Solve the differential equation for Newton’s Law of Cooling to find the temperature in the following cases. Then answer any additional questions.

27. A cup of coffee has a temperature of 90°C when it is poured and allowed to cool in a room with a temperature of 25°C. One minute after the coffee is poured, its temperature is 85°C. How long must you wait until the coffee is cool enough to drink, say 30°C?

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Chapter 9 Solutions

Calculus, Early Transcendentals, Single Variable Loose-Leaf Edition Plus MyLab Math with Pearson eText - 18-Week Access Card Package

Ch. 9.1 - What are the orders of the equations in Example 2?...Ch. 9.1 - What is the solution of the initial value problem...Ch. 9.1 - Solve the initial value problem in Example 4a with...Ch. 9.1 - Suppose the initial conditions in Example 5a are...Ch. 9.1 - In Example 7, if the height function were given by...Ch. 9.1 - Consider the differential equation y(t) + 9y(t) =...Ch. 9.1 - If the general solution of a differential equation...Ch. 9.1 - Does the function y(t) = 2t satisfy the...Ch. 9.1 - Does the function y(t) = 6e3t satisfy the initial...Ch. 9.1 - The solution to the initial value problem y(t) = 2...
Ch. 9.1 - Explain why the graph of the solution to the...Ch. 9.1 - Verifying general solutions Verify that the given...Ch. 9.1 - Verifying general solutions Verify that the given...Ch. 9.1 - Verifying general solutions Verify that the given...Ch. 9.1 - Verifying general solutions Verify that the given...Ch. 9.1 - Verifying general solutions Verify that the given...Ch. 9.1 - Verifying general solutions Verify that the given...Ch. 9.1 - Verifying general solutions Verify that the given...Ch. 9.1 - Verifying general solutions Verify that the given...Ch. 9.1 - Verifying general solutions Verify that the given...Ch. 9.1 - Verifying general solutions Verify that the given...Ch. 9.1 - Verifying solutions of initial value problems...Ch. 9.1 - Verifying solutions of initial value problems...Ch. 9.1 - Verifying solutions of initial value problems...Ch. 9.1 - Verifying solutions of initial value problems...Ch. 9.1 - Finding general solutions Find the general...Ch. 9.1 - Finding general solutions Find the general...Ch. 9.1 - Finding general solutions Find the general...Ch. 9.1 - Finding general solutions Find the general...Ch. 9.1 - Finding general solutions Find the general...Ch. 9.1 - Finding general solutions Find the general...Ch. 9.1 - Finding general solutions Find the general...Ch. 9.1 - Finding general solutions Find the general...Ch. 9.1 - General solutions Find the general solution of the...Ch. 9.1 - General solutions Find the general solution of the...Ch. 9.1 - General solutions Find the general solution of the...Ch. 9.1 - General solutions Find the general solution of the...Ch. 9.1 - Solving initial value problems Solve the following...Ch. 9.1 - Solving initial value problems Solve the following...Ch. 9.1 - Solving initial value problems Solve the following...Ch. 9.1 - Solving initial value problems Solve the following...Ch. 9.1 - Solving initial value problems Solve the following...Ch. 9.1 - Solving initial value problems Solve the following...Ch. 9.1 - Solving initial value problems Find the solution...Ch. 9.1 - Solving initial value problems Find the solution...Ch. 9.1 - Solving initial value problems Find the solution...Ch. 9.1 - Solving initial value problems Find the solution...Ch. 9.1 - Motion in a gravitational field An object is fired...Ch. 9.1 - Prob. 44ECh. 9.1 - Harvesting problems Consider the harvesting...Ch. 9.1 - Harvesting problems Consider the harvesting...Ch. 9.1 - Draining tanks Consider the tank problem in...Ch. 9.1 - Prob. 48ECh. 9.1 - Explain why or why not Determine whether the...Ch. 9.1 - A second-order equation Consider the differential...Ch. 9.1 - Another second-order equation Consider the...Ch. 9.1 - Drug infusion The delivery of a drug (such as an...Ch. 9.1 - Logistic population growth Widely used models for...Ch. 9.1 - Free fall One possible model that describes the...Ch. 9.1 - Chemical rate equations The reaction of certain...Ch. 9.1 - Tumor growth The growth of cancer tumors may be...Ch. 9.2 - Assuming solutions are unique (at most one...Ch. 9.2 - Prob. 2QCCh. 9.2 - Prob. 3QCCh. 9.2 - Notice that the errors in Table 9.1 increase in...Ch. 9.2 - Explain how to sketch the direction field of the...Ch. 9.2 - Prob. 2ECh. 9.2 - Prob. 3ECh. 9.2 - Prob. 4ECh. 9.2 - Identifying direction fields Which of the...Ch. 9.2 - Direction fields A differential equation and its...Ch. 9.2 - Prob. 8ECh. 9.2 - Direction fields with technology Plot a direction...Ch. 9.2 - Prob. 10ECh. 9.2 - Direction fields with technology Plot a direction...Ch. 9.2 - Sketching direction fields Use the window [2, 2] ...Ch. 9.2 - Sketching direction fields Use the window [2, 2] ...Ch. 9.2 - Sketching direction fields Use the window [2, 2] ...Ch. 9.2 - Sketching direction fields Use the window [2, 2] ...Ch. 9.2 - Sketching direction fields Use the window [2, 2] ...Ch. 9.2 - Increasing and decreasing solutions Consider the...Ch. 9.2 - Increasing and decreasing solutions Consider the...Ch. 9.2 - Increasing and decreasing solutions Consider the...Ch. 9.2 - Increasing and decreasing solutions Consider the...Ch. 9.2 - Logistic equations Consider the following logistic...Ch. 9.2 - Logistic equations Consider the following logistic...Ch. 9.2 - Logistic equations Consider the following logistic...Ch. 9.2 - Logistic equations Consider the following logistic...Ch. 9.2 - Two steps of Eulers method For the following...Ch. 9.2 - Two steps of Eulers method For the following...Ch. 9.2 - Two steps of Eulers method For the following...Ch. 9.2 - Two steps of Eulers method For the following...Ch. 9.2 - Errors in Eulers method Consider the following...Ch. 9.2 - Errors in Eulers method Consider the following...Ch. 9.2 - Prob. 31ECh. 9.2 - Prob. 32ECh. 9.2 - Prob. 33ECh. 9.2 - Prob. 34ECh. 9.2 - Prob. 35ECh. 9.2 - Prob. 36ECh. 9.2 - Prob. 37ECh. 9.2 - Equilibrium solutions A differential equation of...Ch. 9.2 - Prob. 39ECh. 9.2 - Prob. 40ECh. 9.2 - Equilibrium solutions A differential equation of...Ch. 9.2 - Equilibrium solutions A differential equation of...Ch. 9.2 - Direction field analysis Consider the first-order...Ch. 9.2 - Eulers method on more general grids Suppose the...Ch. 9.2 - Analyzing models The following models were...Ch. 9.2 - Prob. 47ECh. 9.2 - Analyzing models The following models were...Ch. 9.2 - Convergence of Eulers method Suppose Eulers method...Ch. 9.2 - Stability of Eulers method Consider the initial...Ch. 9.3 - Which of the following equations are separable?...Ch. 9.3 - Write y(t) = (t2 + 1)/y3 in separated form.Ch. 9.3 - Find the value of the constant C in Example 2 with...Ch. 9.3 - Find the value of the constant C in Example 3 with...Ch. 9.3 - What is a separable first-order differential...Ch. 9.3 - Is the equation t2y(t)=t+4y2 separable?Ch. 9.3 - Is the equation y(t)=2yt separable?Ch. 9.3 - Explain how to solve a separable differential...Ch. 9.3 - Solving separable equations Find the general...Ch. 9.3 - Solving separable equations Find the general...Ch. 9.3 - Solving separable equations Find the general...Ch. 9.3 - Solving separable equations Find the general...Ch. 9.3 - Solving separable equations Find the general...Ch. 9.3 - Solving separable equations Find the general...Ch. 9.3 - Solving separable equations Find the general...Ch. 9.3 - Solving separable equations Find the general...Ch. 9.3 - Solving separable equations Find the general...Ch. 9.3 - Solving separable equations Find the general...Ch. 9.3 - Solving separable equations Find the general...Ch. 9.3 - Solving separable equations Find the general...Ch. 9.3 - Solving initial value problems Determine whether...Ch. 9.3 - Solving initial value problems Determine whether...Ch. 9.3 - Solving initial value problems Determine whether...Ch. 9.3 - Solving initial value problems Determine whether...Ch. 9.3 - Solving initial value problems Determine whether...Ch. 9.3 - Solving initial value problems Determine whether...Ch. 9.3 - Solving initial value problems Determine whether...Ch. 9.3 - Solving initial value problems Determine whether...Ch. 9.3 - Solving initial value problems Determine whether...Ch. 9.3 - Solving initial value problems Determine whether...Ch. 9.3 - Solving initial value problems Determine whether...Ch. 9.3 - Solutions of separable equations Solve the...Ch. 9.3 - Solving initial value problems Determine whether...Ch. 9.3 - Solving initial value problems Determine whether...Ch. 9.3 - Solving initial value problems Determine whether...Ch. 9.3 - Solving initial value problems Determine whether...Ch. 9.3 - Solutions in implicit form Solve the following...Ch. 9.3 - Solutions in implicit form Solve the following...Ch. 9.3 - Solutions in implicit form Solve the following...Ch. 9.3 - Solutions in implicit form Solve the following...Ch. 9.3 - Solutions in implicit form Solve the following...Ch. 9.3 - Solutions in implicit form Solve the following...Ch. 9.3 - Logistic equation for a population A community of...Ch. 9.3 - Logistic equation for an epidemic When an infected...Ch. 9.3 - Explain why or why not Determine whether the...Ch. 9.3 - Implicit solutions for separable equations For the...Ch. 9.3 - Implicit solutions for separable equations For the...Ch. 9.3 - Orthogonal trajectories Two curves are orthogonal...Ch. 9.3 - Orthogonal trajectories Use the method in Exercise...Ch. 9.3 - Applications 44.Logistic equation for spread of...Ch. 9.3 - Free fall An object in free fall may be modeled by...Ch. 9.3 - Free fall Using the background given in Exercise...Ch. 9.3 - Torricellis law An open cylindrical tank initially...Ch. 9.3 - Chemical rate equations Let y(t) be the...Ch. 9.3 - Tumor growth The Gompertz growth equation is often...Ch. 9.3 - Blowup in finite time Consider the initial value...Ch. 9.3 - Analysis of a separable equation Consider the...Ch. 9.4 - Verify by substitution that y(t) = Cekt b/k is a...Ch. 9.4 - Prob. 2QCCh. 9.4 - Prob. 3QCCh. 9.4 - Prob. 4QCCh. 9.4 - In general, what is the equilibrium temperature...Ch. 9.4 - The general solution of a first-order linear...Ch. 9.4 - Prob. 2ECh. 9.4 - What is the general solution of the equation y'(t)...Ch. 9.4 - Prob. 4ECh. 9.4 - First-order linear equations Find the general...Ch. 9.4 - First-order linear equations Find the general...Ch. 9.4 - First-order linear equations Find the general...Ch. 9.4 - First-order linear equations Find the general...Ch. 9.4 - First-order linear equations Find the general...Ch. 9.4 - First-order linear equations Find the general...Ch. 9.4 - Initial value problems Solve the following initial...Ch. 9.4 - Initial value problems Solve the following initial...Ch. 9.4 - Initial value problems Solve the following initial...Ch. 9.4 - Initial value problems Solve the following initial...Ch. 9.4 - Initial value problems Solve the following initial...Ch. 9.4 - Initial value problems Solve the following initial...Ch. 9.4 - Stability of equilibrium points Find the...Ch. 9.4 - Stability of equilibrium points Find the...Ch. 9.4 - Stability of equilibrium points Find the...Ch. 9.4 - Stability of equilibrium points Find the...Ch. 9.4 - Stability of equilibrium points Find the...Ch. 9.4 - Stability of equilibrium points Find the...Ch. 9.4 - Loan problems The following initial value problems...Ch. 9.4 - Loan problems The following initial value problems...Ch. 9.4 - Loan problems The following initial value problems...Ch. 9.4 - Loan problems The following initial value problems...Ch. 9.4 - Newtons Law of Cooling Solve the differential...Ch. 9.4 - Newton's Law of Cooling Solve the differential...Ch. 9.4 - Newtons Law of Cooling Solve the differential...Ch. 9.4 - Prob. 30ECh. 9.4 - Intravenous drug dosing The amount of drug in the...Ch. 9.4 - Optimal harvesting rate Let y(t) be the population...Ch. 9.4 - Endowment model An endowment is an investment...Ch. 9.4 - Explain why or why not Determine whether the...Ch. 9.4 - Prob. 36ECh. 9.4 - A bad loan Consider a loan repayment plan...Ch. 9.4 - Prob. 38ECh. 9.4 - Special equations A special class of first-order...Ch. 9.4 - Prob. 40ECh. 9.4 - Special equations A special class of first-order...Ch. 9.4 - Prob. 42ECh. 9.4 - Prob. 43ECh. 9.4 - Prob. 44ECh. 9.4 - General first-order linear equations Consider the...Ch. 9.4 - Prob. 46ECh. 9.4 - Prob. 47ECh. 9.4 - General first-order linear equations Consider the...Ch. 9.5 - Explain why the maximum growth rate for the...Ch. 9.5 - Prob. 2QCCh. 9.5 - Prob. 3QCCh. 9.5 - Explain how the growth rate function determines...Ch. 9.5 - Prob. 2ECh. 9.5 - Explain how the growth rate function can be...Ch. 9.5 - Prob. 4ECh. 9.5 - Is the differential equation that describes a...Ch. 9.5 - What are the assumptions underlying the...Ch. 9.5 - Describe the solution curves in a predator-prey...Ch. 9.5 - Prob. 8ECh. 9.5 - Solving logistic equations Write a logistic...Ch. 9.5 - Solving logistic equations Write a logistic...Ch. 9.5 - Designing logistic functions Use the method of...Ch. 9.5 - Designing logistic functions Use the method of...Ch. 9.5 - Prob. 19ECh. 9.5 - Prob. 20ECh. 9.5 - Solving the Gompertz equation Solve the Gompertz...Ch. 9.5 - Prob. 22ECh. 9.5 - Stirred tank reactions For each of the following...Ch. 9.5 - Stirred tank reactions For each of the following...Ch. 9.5 - Stirred tank reactions For each of the following...Ch. 9.5 - Stirred tank reactions For each of the following...Ch. 9.5 - Prob. 31ECh. 9.5 - Growth rate functions a.Show that the logistic...Ch. 9.5 - Solution of the logistic equation Use separation...Ch. 9.5 - Properties of the Gompertz solution Verify that...Ch. 9.5 - Properties of stirred tank solutions a.Show that...Ch. 9.5 - Prob. 36ECh. 9.5 - RC circuit equation Suppose a battery with voltage...Ch. 9.5 - U.S. population projections According to the U.S....Ch. 9 - Explain why or why not Determine whether the...Ch. 9 - Prob. 2RECh. 9 - General solutions Use the method of your choice to...Ch. 9 - General solutions Use the method of your choice to...Ch. 9 - General solutions Use the method of your choice to...Ch. 9 - Prob. 6RECh. 9 - General solutions Use the method of your choice to...Ch. 9 - General solutions Use the method of your choice to...Ch. 9 - General solutions Use the method of your choice to...Ch. 9 - Prob. 10RECh. 9 - Solving initial value problems Use the method of...Ch. 9 - Prob. 12RECh. 9 - Solving initial value problems Use the method of...Ch. 9 - Prob. 14RECh. 9 - Solving initial value problems Use the method of...Ch. 9 - Solving initial value problems Use the method of...Ch. 9 - Solving initial value problems Use the method of...Ch. 9 - Solving initial value problems Use the method of...Ch. 9 - Direction fields Consider the direction field for...Ch. 9 - Direction fields The direction field for the...Ch. 9 - Eulers method Consider the initial value problem...Ch. 9 - Equilibrium solutions Find the equilibrium...Ch. 9 - Equilibrium solutions Find the equilibrium...Ch. 9 - Equilibrium solutions Find the equilibrium...Ch. 9 - Equilibrium solutions Find the equilibrium...Ch. 9 - Logistic growth The population of a rabbit...Ch. 9 - Logistic growth parameters A cell culture has a...Ch. 9 - Logistic growth in India The population of India...Ch. 9 - Stirred tank reaction A 100-L tank is filled with...Ch. 9 - Newtons Law of Cooling A cup of coffee is removed...Ch. 9 - A first-order equation Consider the equation...Ch. 9 - A second-order equation Consider the equation...

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