Exercise · ZW-LAPLACE-TRANSFORM-004 · ★☆☆ Basic
Compute \(\mathcal L\{\sin3t\}(s)\).
Choose one option.
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- D. \(\tfrac3{s^2+9}\)
Explanation
With \(\mathcal L\{\sin bt\}=b/(s^2+b^2)\) and \(b=3\) we get \(3/(s^2+9)\). The numerator \(s\) belongs to the cosine.
Review the concept: Laplace transform
The Laplace transform \(\mathcal L\) assigns to a function \(f(t)\), defined for \(t\ge0\), the function \(F(s)\) obtained by integrating \(f\) times \(e^{-st}\) over \([0,\infty)\).
\[\mathcal L\{f\}(s)=F(s)=\int_0^\infty e^{-st}f(t)\,dt\]
More practice problems: laplace transform
- ZW-LAPLACE-TRANSFORM-001 Compute mathcal L\1\(s) for s>0.
- ZW-LAPLACE-TRANSFORM-002 Compute mathcal L\t\(s).
- ZW-LAPLACE-TRANSFORM-003 Compute mathcal L\e^3t\(s) for s>3.
- ZW-LAPLACE-TRANSFORM-005 Compute mathcal L\cos 2t\(s).
- ZW-LAPLACE-TRANSFORM-006 Compute mathcal L\t^2\(s).
- ZW-LAPLACE-TRANSFORM-007 Use linearity to compute mathcal L\3+2t\(s).
- ZW-LAPLACE-TRANSFORM-008 Compute mathcal L\te^t\(s).
- ZW-LAPLACE-TRANSFORM-009 For which values of s does the integral defining mathcal L\e^2t\(s) converge?