Quote:
Originally Posted by Oblarg
Strictly speaking, what you're doing is not simply dimensional analysis. Dimensional analysis would be multiplying the characteristic size of the wheel by the characteristic speed of the motor; it thus usually results in loss of dimensionless constants.
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Isn't that only true if you construct the system using dimensionless constants? You can specify that you're looking for ft/s from rev/min, and use dimensions of ft/rev (from the circumference equation, so your
π should be included there in the unit conversion) to keep everything consistent.