We have determined for the first time in elementary functions an analytically exact period for the vibrations of a physical pendulum for large angles (up to 90°) of deviations from the vertical axis.
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Translated from Izmeritel’naya Tekhnika, No. 6, pp. 39–41, June, 2016.
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Kochetkov, A.V., Chelpanov, I.B. & Fedotov, P.V. Determination of the Period of Large Vibrations of a Pendulum in Elementary Functions. Meas Tech 59, 610–613 (2016). https://doi.org/10.1007/s11018-016-1017-y
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DOI: https://doi.org/10.1007/s11018-016-1017-y