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Calculus- Early Transcendentals, 2021a

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392 Differential Equations<br />

Exercise 10.5.2 Solve the initial value problem 2y ′′ + 18y = 0, y(0)=2,y ′ (0)=15.<br />

Exercise 10.5.3 Solve the initial value problem y ′′ + 6y ′ + 5y = 0, y(0)=1, y ′ (0)=0.<br />

Exercise 10.5.4 Solve the initial value problem y ′′ − y ′ − 12y = 0, y(0)=0, y ′ (0)=14.<br />

Exercise 10.5.5 Solve the initial value problem y ′′ + 12y ′ + 36y = 0, y(0)=5,y ′ (0)=−10.<br />

Exercise 10.5.6 Solve the initial value problem y ′′ − 8y ′ + 16y = 0, y(0)=−3, y ′ (0)=4.<br />

Exercise 10.5.7 Solve the initial value problem y ′′ + 5y = 0, y(0)=−2, y ′ (0)=5.<br />

Exercise 10.5.8 Solve the initial value problem y ′′ + y = 0,y(π/4)=0, y ′ (π/4)=2.<br />

Exercise 10.5.9 Solve the initial value problem y ′′ + 12y ′ + 37y = 0, y(0)=4,y ′ (0)=0.<br />

Exercise 10.5.10 Solve the initial value problem y ′′ + 6y ′ + 18y = 0, y(0)=0,y ′ (0)=6.<br />

Exercise 10.5.11 Solve the initial value problem y ′′ + 4y = 0, y(0)= √ 3,y ′ (0)=2.<br />

Exercise 10.5.12 Solve the initial value problem y ′′ + 100y = 0, y(0)=5,y ′ (0)=50.<br />

Exercise 10.5.13 Solve the initial value problem y ′′ + 4y ′ + 13y = 0, y(0)=1,y ′ (0)=1.<br />

Exercise 10.5.14 Solve the initial value problem y ′′ − 8y ′ + 25y = 0, y(0)=3,y ′ (0)=0.<br />

Exercise 10.5.15 A mass-spring system my ′′ + by ′ + kx has k = 29, b= 4, and m = 1. At time t = 0 the<br />

position is y(0)=2 and the velocity is y ′ (0)=1. Findy(t).<br />

Exercise 10.5.16 A mass-spring system my ′′ + by ′ + kx has k = 24, b= 12, and m = 3. At time t = 0 the<br />

position is y(0)=0 and the velocity is y ′ (0)=−1. Findy(t).<br />

Exercise 10.5.17 Consider the differential equation ay ′′ + by ′ = 0, with a and b both non-zero. Find the<br />

general solution by the method of this section. Now let g = y ′ ; the equation may be written as ag ′ +bg = 0,<br />

a first order linear homogeneous equation. Solve this for g, then use the relationship g = y ′ to find y.<br />

Exercise 10.5.18 Suppose that y(t) is a solution to ay ′′ + by ′ + cy = 0, y(t 0 )=0, y ′ (t 0 )=0. Show that<br />

y(t)=0.<br />

10.6 Second Order Linear Equations - Method of Undetermined Coefficients<br />

Now we consider second order equations of the form ay ′′ + by ′ + cy = f (t), with a, b, andc constant. Of<br />

course, if a = 0 this is really a first order equation, so we assume a ≠ 0. Also, if c = 0 we can solve the

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