Pöörlemissagedust saab formuleerida ka pöörete arvu N hetkelise muutumise kiirusena aja suhtes, t: n = dN/dt (vastavalt rahvusvahelisele suuruste süsteemile).
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Sarnaselt tavalisele perioodile on pöörlemissageduse vastastikune väärtus pöörlemisperiood, T = ν−1 = n−1 , aja mõõtmega (SI ühik sekund).
Rotational frequency can also be formulated as the instantaneous rate of change of the number of rotations, N, with respect to time, t: n = dN/dt (as per International System of Quantities).
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Similar to ordinary period, the reciprocal of rotational frequency is the rotation period or period of rotation, T = ν−1 = n−1 , with dimension of time (SI unit seconds).
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