  A conservative scaling model based on Newton's law of circular motion and the
virial theorem is proposed. Employing dimensionless scaling relations, a
physical solution to the Baryonic Tully-Fisher Relation (BTFR) is obtained and
the origin of the Radial Acceleration Relation (RAR) is provided. A simple
model of the Milky Way's dynamics reveals excellent agreement with recent Gaia
DR2 kinematical results.
