Laplace Transforms of Discontinuous functions

In summary, Laplace Transforms are a mathematical tool used to convert functions from the time domain to the frequency domain. To calculate the Laplace Transform of a discontinuous function, the function needs to be broken into separate pieces and the formula applied to each piece. Laplace Transforms can be used on any discontinuous function, but more complex functions may require advanced techniques. The main advantage of using Laplace Transforms for discontinuous functions is the ability to solve differential equations, but a limitation is that it assumes the function is zero for all negative time values.
  • #1
Gilligan08
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Homework Statement



(t − 1)^2u(t − 1) Find the Laplace transform.

Homework Equations



L{f(t-a)u(t-a)}(s) = e^-as F(s)

The Attempt at a Solution



The solution manual says take f(t) = t^2, I don't see why? Why is f(t) not (t-1)^2?
 
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  • #2
Because t-1 is in the argument of f. If f(t-1)=(t-1)^2, I would say f(t)=t^2.
 

FAQ: Laplace Transforms of Discontinuous functions

What are Laplace Transforms of discontinuous functions?

Laplace Transforms of discontinuous functions are a mathematical tool used to convert a function from the time domain to the frequency domain. This can be especially useful when dealing with functions that have sudden jumps or changes, known as discontinuities.

How do I calculate the Laplace Transform of a discontinuous function?

To calculate the Laplace Transform of a discontinuous function, you first need to identify the discontinuity points and break the function into separate pieces. Then you can apply the Laplace Transform formula to each piece and combine the results to get the overall Laplace Transform of the function.

Can Laplace Transforms be used on any discontinuous function?

Yes, Laplace Transforms can be used on any function, including discontinuous ones. However, the calculation process may be more complex for functions with multiple or complex discontinuities, and may require the use of more advanced techniques.

What are the advantages of using Laplace Transforms for discontinuous functions?

The main advantage of using Laplace Transforms for discontinuous functions is that it allows us to easily solve differential equations involving these functions. This can be especially useful in engineering and physics applications.

Are there any limitations to using Laplace Transforms for discontinuous functions?

One limitation of using Laplace Transforms for discontinuous functions is that it assumes the function is zero for all negative time values. This means that the Laplace Transform may not accurately represent the behavior of the function before the discontinuity point.

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