Aperson watches an ambulance drive by them while emitting a steady sound from its siren. when the ambulance passes the person (switching from moving towards him to moving away from him), the perceived frequency of the sound he receives decreases by 8.50 percent. how fast is the ambulance driving? give your answer as a positive number. assume room temperature air.

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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.