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23.5: Затухаючий коливальний рух
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\[E=\frac{1}{2} k x_{\mathrm{m}}^{2} \cos ^{2}(\gamma t) e^{-2 \alpha t}+\frac{1}{2} m\left(-\gamma x_{\mathrm{m}} \sin (\gamma t)-\alpha x_{\mathrm{m}} \cos (\gamma t)\right)^{2} e^{-2 \alpha t} \non... $E=\frac{1}{2} k x_{\mathrm{m}}^{2} \cos ^{2}(\gamma t) e^{-2 \alpha t}+\frac{1}{2} m\left(-\gamma x_{\mathrm{m}} \sin (\gamma t)-\alpha x_{\mathrm{m}} \cos (\gamma t)\right)^{2} e^{-2 \alpha t} \nonumber$ $E=\frac{1}{2}\left(k+m \alpha^{2}\right) x_{\mathrm{m}}^{2} \cos ^{2}(\gamma t) e^{-2 \alpha t}+m \gamma \alpha x_{\mathrm{m}}^{2} \sin (\gamma t) \cos (\gamma t) e^{-2 \alpha t}+\frac{1}{2} m \gamma^{2} x_{\mathrm{m}}^{2} \sin ^{2}(\gamma t) e^{-2 \alpha t} \nonumber$