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What does it mean when an oil is labeled with an ISO range rather than a single ISO value

In the US, motor oils are sold with viscosity ranges ascribed to them if they contain additives that flatten the viscosity-versus-temperature curve (so-called "multi-viscosity" oils). Is the ...
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Second Order Transfer Function Question regarding Overshoot Formula

Formula is derived for pure 2nd order TF without any zeros. The validity of the formula for cases with zeros depends on relative position of the zero with regard to poles. The poles of $T(s)$ are \...
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