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Damped harmonic oscillator

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Damping force and total energy. See attached file for full problem description.

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A detailed solution is given that discusses the damping force and total energy.

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documentclass[a4paper]{article}
usepackage{amsmath,amssymb}
newcommand{haak}[1]{!left(#1right)}
newcommand{rhaak}[1]{!left [#1right]}
newcommand{lhaak}[1]{left | #1right |}
newcommand{ahaak}[1]{!left{#1right}}
newcommand{gem}[1]{leftlangle #1rightrangle}
newcommand{gemc}[2]{leftlangleleftlangleleft. #1right | #2
rightranglerightrangle}
newcommand{geml}[1]{leftlangle #1right.}
newcommand{gemr}[1]{left. #1rightrangle}
newcommand{haakl}[1]{left(#1right.}
newcommand{haakr}[1]{left.#1right)}
newcommand{rhaakl}[1]{left[#1right.}
newcommand{rhaakr}[1]{left.#1right]}
newcommand{lhaakl}[1]{left |#1right.}
newcommand{lhaakr}[1]{left.#1right |}
newcommand{ket}[1]{lhaakl{gemr{#1}}}
newcommand{bra}[1]{lhaakr{geml{#1}}}
newcommand{braket}[3]{gem{#1lhaak{#2}#3}}
newcommand{floor}[1]{leftlfloor #1rightrfloor}
newcommand{half}{frac{1}{2}}
newcommand{kwart}{frac{1}{4}}
newcommand{bfm}[1]{{bf #1}}
renewcommand{imath}{text{i}}

begin{document}
title{Damped Oscillator}
date{}
author{}
maketitle
Newton's second law implies that:
begin{equation}label{diff}
begin{split}
&mfrac{d^{2}x}{dt^{2}}=-kx-2beta m frac{dx}{dt}Longrightarrow
&frac{d^{2}x}{dt^{2}} + 2beta frac{dx}{dt} + frac{k}{m}x =0
end{split}
end{equation}
If you insert a trial ...

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