For 10 points, name this function that is applied to length to get units of volume.
The power that can be extracted from a windmill depends on this function of the wind speed. The self-force on a particle is inversely proportional to this function of the speed of light. Planck's law predicts that the radiance of a blackbody depends on this function of the frequency over the exponential of frequency. At very low temperatures, phonons cause the heat capacity of a solid to vary with this function of temperature. The reciprocal of this function of the radius is proportional to a (*)  dipole's electric field. The orbital period is proportional to the square root of this function of the semimajor axis according to Kepler's third law. The universal gravitational constant has units containing this function of length. For 10 points, name this function that is applied to length to get units of volume.
The power that can be extracted from a windmill depends on this function of the wind speed.
cube d [or  third power ]