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15.3: Періодичний рух
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Період - це тривалість одного циклу в повторюваному заході, тоді як частота - це кількість циклів за одиницю часу.
23.3: Енергія та простий гармонійний осцилятор
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\[\frac{d \theta}{d t}\left(t_{1}\right)=-\sqrt{\frac{g}{l}} \theta_{0} \sin \left(\sqrt{\frac{g}{l}} t_{1}\right)=-\sqrt{\frac{g}{l}} \theta_{0} \sin \left(\frac{\pi}{2}\right)=-\sqrt{\frac{g}{l}} \t... $\frac{d \theta}{d t}\left(t_{1}\right)=-\sqrt{\frac{g}{l}} \theta_{0} \sin \left(\sqrt{\frac{g}{l}} t_{1}\right)=-\sqrt{\frac{g}{l}} \theta_{0} \sin \left(\frac{\pi}{2}\right)=-\sqrt{\frac{g}{l}} \theta_{0} \nonumber$ $v_{\theta}\left(t_{1}\right) \equiv v_{1}=l \frac{d \theta}{d t}\left(t_{1}\right)=-l \sqrt{\frac{g}{l}} \theta_{0} \sin \left(\sqrt{\frac{g}{l}} t_{1}\right)=-\sqrt{l g} \theta_{0} \sin \left(\frac{\pi}{2}\right)=-\sqrt{\lg } \theta_{0} \cdot(23.3 .32) \nonumber$