A symmetrical double cone piece is positioned on the narrow end of a triangular track with a slight incline at the other end. The shape of the track and the pitch of the cones are such that the centre ...

So weight is a gravitational force on an object that has mass. The weight of an object may be thought of as acting at a single point called its centre of mass. Depending on the object's shape ...

Acoustic wave behaviour is affected by material parameters such as mass density and bulk ... metamaterials with a Dirac-like cone at the Brillouin zone centre exhibit double zero-index properties ...