Suatu bandul sederhana membuat 20 getaran selama80 sekon. Jika g = 10 m/s2, panjang bandul adalah.
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[tex]t \: = \frac{t}{n} \\ \\ t = \frac{80}{20} \\ \\ t \: = 4s[/tex]
[tex]t \: = 2\pi. \sqrt{ \frac{l}{g } } \\ \\ 4 = 2\pi. \sqrt{ \frac{l}{10} } \\ \\ \frac{4}{5} \pi = \sqrt{ \frac{4}{10} } [/tex]
[tex] \frac{2}{\pi} = \sqrt{ \frac{l}{10} } \\ \\ \frac{4}{ {\pi}^{2} } = \frac{l}{10} \\ \\ l . \: {\pi}^{2} = 40 \\ \\ l = \: \: \: 4 \: m[/tex]
jadi, panjang bandul adalah 4 m
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