Encyclopedia > Rotor

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A rotor is a rotating part of a machine, as in a motor, a pump or a helicopter. The part of the machine that does not rotate is called the stator.

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Quadratic formula

... the common denominator is 4a2. We get <math>\left(x+\frac{b}{2a}\right)^2=\frac{-4ac+b^2}{4a^2}=\frac{b^2-4ac}{4a^2}.</math> Taking square roots ...

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