This frequency and thus the relativistic energy are frame-dependent.

As a consequence relativistic energy such as light, which is trace free, still obeys the Equivalence Principle.

In addition, that the speed of light is unreachable for massive bodies was measured in many Tests of relativistic energy and momentum.

This is experimentally established in many tests of relativistic energy and momentum.

It could accelerate any nuclei in the periodic table to relativistic energies.

Thermal measurements in order to estimate the relativistic kinetic energy were already carried out by Bertozzi as mentioned above.

There are also many examples of conversion of relativistic kinetic energy into rest energy.

Therefore, the Bucherer-Kaufmann-Neumann experiments can be seen as early tests of relativistic energy and momentum.

Its one-piece magnet has an azimuthally varying magnetic field for vertical focusing even at relativistic energies.

This same equation also connects relativistic mass and "relativistic energy" (total system energy).