Chapter 7: Problem 1
What is the order of \(y^{\prime \prime}(t)+9 y(t)=10 ?\)
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These are the key concepts you need to understand to accurately answer the question.
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Chapter 7: Problem 1
What is the order of \(y^{\prime \prime}(t)+9 y(t)=10 ?\)
These are the key concepts you need to understand to accurately answer the question.
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Sociologists model thespread of rumors using logistic equations. The key
assumption is that at any given time, a fraction \(y\) of the population, where
\(0 \leq y \leq 1,\) knows the rumor, while the remaining fraction \(1-y\) does
not. Furthermore, the rumor spreads by interactions between those who know the
rumor and those who do not. The number of such interactions is proportional to
\(y(1-y) .\) Therefore, the equation that models the spread of the rumor is
\(y^{\prime}(t)=k y(1-y)\), where \(k\) is a positive real number. The fraction of
people who initially know the rumor is \(y(0)=y_{0},\) where \(0
Two integration approaches Evaluate \(\int \cos (\ln x) d x\) two different ways: a. Use tables after first using the substitution \(u=\ln x.\) b. Use integration by parts twice to verify your answer to part (a).
The reaction of chemical compounds can often be modeled by differential equations. Let \(y(t)\) be the concentration of a substance in reaction for \(t \geq 0\) (typical units of \(y\) are moles/L). The change in the concentration of the substance, under appropriate conditions, is \(\frac{d y}{d t}=-k y^{n},\) where \(k>0\) is a rate constant and the positive integer \(n\) is the order of the reaction. a. Show that for a first-order reaction \((n=1),\) the concentration obeys an exponential decay law. b. Solve the initial value problem for a second-order reaction \((n=2)\) assuming \(y(0)=y_{0}\). c. Graph and compare the concentration for a first-order and second-order reaction with \(k=0.1\) and \(y_{0}=1\).
Compare the errors in the Midpoint and Trapezoid Rules with \(n=4,8,16,\) and 32 subintervals when they are applied to the following integrals (with their exact values given). \(\int_{0}^{\pi} \ln (5+3 \cos x) d x=\pi \ln \frac{9}{2}\)
Approximate the following integrals using Simpson's Rule. Experiment with values of \(n\) to ensure that the error is less than \(10^{-3}\). \(\int_{0}^{2 \pi} \frac{d x}{(5+3 \sin x)^{2}}=\frac{5 \pi}{32}\)
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