If the radius of the path of electron 9.1x10kg is 0.28 m moving in magnetic field of 6x104T perpendicular to it. Calculate its energy in Kev and what is its frequency?

The rocks expand when there hot/warm  and contract when they are cold.

Indoraptor for sure

stands for electromotive force and it is measured in volts. despite its name, it is not actually the force in the sense of being a "pushing" or "pulling" (not measured in newtons).an equation that relates emf,  ℰ,  to a battery's terminal voltage, v, current, i, and internal resistance, r, is    ℰ = v + irin this case, the emf can be interpreted as a voltage—a difference in electric potential.i would not say that it would be considered an energy. if emf can be defined as the energy/work per a unit charge from a battery or other electric source, then it is not strictly energy.