Q15P By using Laplace transforms, sol... [FREE SOLUTION]

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Chapter 8: Q15P (page 443)

By using Laplace transforms, solve the following differential equations subject to the given initial conditions.
$y^{'}' + 9 y = \cos 3 t, 鈥� y_{0} = 0, y_{0}^{'} = 6$

Short Answer

Expert verified

The given differential equation's solution is $y = \frac{1}{6} t \sin 2 t + 2 \sin 3 t$ .

Step by step solution

Given information from question

The differential equation is $y^{'}' + 9 y = \cos 3 t, 鈥� y_{0} = 0, y_{0}^{'} = 6 .$ .

Laplace transform

Application of Laplace transform:

It's used to simplify complicated differential equations by using polynomials. It's used to convert derivatives into numerous domain variables, then utilise the Inverse Laplace transform to convert the polynomials back to the differential equation.

Take the Laplace of given equation

The given equation is

$y " + 9 y = c o s 3 t$

Take the Laplace of equation

$L \{y^{'}' + 9 y\} = L \{\cos 3 t\} L \{y "\} + 9 L \{y\} = L \{\sin t\} p^{2} L \{y\} - {py}_{o} - y'_{0} + 9 L \{y\} = \frac{p}{p^{2} + 9} (p^{2} + 9) L \{y\} - {py}_{o} - y'_{0} = \frac{p}{p^{2} + 9}$

Further solve

$(p^{2} + 9) L \{y\} - p (0) - 6 = \frac{p}{p^{2} + 9} (p^{2} + 9) L \{y\} = \frac{p}{p^{2} + 9} + 6 L \{y\} = \frac{p}{(p^{2} + 9) {(p^{2} + 9)}^{2}} + \frac{6}{(p^{2} + 9)} L \{y\} = \frac{p}{{(p^{2} + 3^{2})}^{2}} + \frac{6}{(p^{2} + 3^{2})}$

The inverse Laplace is

$y = L^{- 1} \{\frac{p}{{(p^{2} + 3^{2})}^{2}}\} + L^{- 1} \{\frac{6}{(p^{2} + 3^{2})}\} y = \frac{1}{6} t \sin 2 t + \frac{6}{3} \sin 3 t y = \frac{1}{6} t \sin 2 t + 2 \sin 3 t$

Thus, the given differential equation's solution is $y = \frac{1}{6} t \sin 2 t + 2 \sin 3 t$ .

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91影视

By using Laplace transforms, solve the following differential equations subject to the given initial conditions.
$y^{'}' + 9 y = \cos 3 t, 鈥� y_{0} = 0, y_{0}^{'} = 6$

Short Answer

Step by step solution

Given information from question

Laplace transform

Take the Laplace of given equation

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Physics Textbooks

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91影视

By using Laplace transforms, solve the following differential equations subject to the given initial conditions.y''+9y=cos3t,鈥�y0=0,y0'=6

Short Answer

Step by step solution

Given information from question

Laplace transform

Take the Laplace of given equation

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Physics Textbooks

Energy Physics

Torque and Rotational Motion

Particle Model of Matter

Thermodynamics

Oscillations

Solid State Physics

Study anywhere. Anytime. Across all devices.

By using Laplace transforms, solve the following differential equations subject to the given initial conditions.
$y^{'}' + 9 y = \cos 3 t, 鈥� y_{0} = 0, y_{0}^{'} = 6$