Question Details

F s( ) is the Laplace transform of the function

F(1) is ________ (correct to two decimal places).

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Correct Answer :

0.5

Solution :

The correct answer is 0.5.

Based on the provided image, the function is given by:
f ( t ) = 2 t 2 e - t

We want to find F(s), which is the Laplace transform of f(t), and evaluate it at s=1.

First, recall the standard Laplace transform formula for tn:
L { t n } = n ! s n + 1

For n=2, this gives:
L { t 2 } = 2 ! s 3 = 2 s 3

Next, we apply the frequency shifting property of the Laplace transform, which states that:
L { e a t g ( t ) } = G ( s - a )

In our case, a=-1, so the transform of t2e-t becomes:
L { t 2 e - t } = 2 ( s + 1 ) 3

Therefore, the Laplace transform F(s) of f(t)=2t2e-t is:
F ( s ) = 2 · 2 ( s + 1 ) 3 = 4 ( s + 1 ) 3

Now, we evaluate F(s) at s=1:
F ( 1 ) = 4 ( 1 + 1 ) 3 = 4 2 3 = 4 8 = 0.5

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