Given f (t)=--1+8 +8,0

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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SUBJECT: DIFFERENTIAL EQUATION

**Problem #5:**

Given the function \( f(t) = -\frac{1}{2}t + 8 \), where \( 0 \leq t < 4 \), and it is periodic such that \( f(t+4) = f(t) \).

Find \( F(s) = \mathcal{L} \{ f(t) \} \) of the Periodic Function. 

**Explanation:**

- **Function Definition:**
  - \( f(t) = -\frac{1}{2}t + 8 \)
  - This is valid for the interval \( 0 \leq t < 4 \).
  - The function repeats every 4 units (periodic with period 4).

- **Objective:**
  - Calculate the Laplace Transform \( F(s) = \mathcal{L} \{ f(t) \} \) for the periodic function described. 

No graphs or diagrams are provided.
Transcribed Image Text:**Problem #5:** Given the function \( f(t) = -\frac{1}{2}t + 8 \), where \( 0 \leq t < 4 \), and it is periodic such that \( f(t+4) = f(t) \). Find \( F(s) = \mathcal{L} \{ f(t) \} \) of the Periodic Function. **Explanation:** - **Function Definition:** - \( f(t) = -\frac{1}{2}t + 8 \) - This is valid for the interval \( 0 \leq t < 4 \). - The function repeats every 4 units (periodic with period 4). - **Objective:** - Calculate the Laplace Transform \( F(s) = \mathcal{L} \{ f(t) \} \) for the periodic function described. No graphs or diagrams are provided.
Expert Solution
Step 1

According to the given information it is required to find

Fs=Lft

Where, L represents Laplace Transformation and given:

ft=12t+8, 0t<4ft+4=ft

 

Step 2

Laplace transformation of a periodic function with period p>0 is given by

Lft=Lf1t×11espLft=0pftestdt1esphere, f1t is one period of the function.

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