Discussion
Windage torque in a rotating machine varies approximately as
Answer: D
Correct answer: the square of the speed
Windage is aerodynamic drag on the rotating parts, and drag varies with the square of the velocity, so the torque does too and the power varies as the cube. This is why windage is negligible in a slow machine and dominant in a high-speed one, and why a flywheel or a turbogenerator rotor is often run in a partial vacuum or in hydrogen.
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