A man stands on a freely rotating platform with his arms extended, his rotational frequency is 0.25revls. But when he draws them in, his frequency is 0.80rev/s. Find the ratio of his moment of inertia in the first case to that in the second. A. 3.2
B. 2.3
C. 4
D. 4.7

Sorry i don’t know what to do

Transfer of electrons. hope it !

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.