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Formulae (3)

QTc = \frac{QT}{\sqrt{RR}}

Heart-rate-corrected QT interval from an ECG.

QTc = \frac{QT}{\sqrt[3]{RR}}

Heart-rate-corrected QT interval using a cube root.

CG = \dfrac{\sum M}{\sum W}

The center of gravity is the total moment divided by total weight — the core of every weight-and-balance calculation.